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Old 09-19-2018, 08:49 AM
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Richard Cooper
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Default oil....

I have a 1981 with a fairly new motor. I want to switch over to synthetic oil, but was wondering if I should use 10W-40 since I only use the car during the summer months? Its stored away from September until April every year. Car only has 3,000 miles on new crate motor. I only drive it about 400-500 miles a year. Thanks for any suggestions.
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Old 09-19-2018, 11:31 AM
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Mr D.
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At 400-500 miles a year not sure what the benefit of synthetic oil will get you. I use Mobile Delvac 1300 15W-40 diesel oil in my 65.
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Old 09-19-2018, 03:39 PM
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In my eyes, synthetic can't hurt it. I run synthetic in mine and change it every thousand miles since it sits so much. I've also been told I way overdo things, so take that as you want
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Old 09-19-2018, 03:54 PM
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Default More info on engine....

flat tappet or roller cam?
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Old 09-19-2018, 04:58 PM
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Originally Posted by Vette5311 View Post
flat tappet or roller cam?
My 81 has flat tappet.
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Old 09-19-2018, 05:35 PM
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look for oil with CJ-4 or CK-4 API specification
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Old 09-19-2018, 07:42 PM
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Originally Posted by Vette5311 View Post
flat tappet or roller cam?
Originally Posted by Richard Cooper View Post
My 81 has flat tappet.
Use an oil with ZDDP and or high zinc content. I lost 2 engines from flat cams before I got this figured out. Lot of controversy here and I'm not looking to start a fight just telling ya what happened to me. No I did not have excessive spring pressure. Yes the cam was broken in properly. Yada yada. Google it or check recommendations on the comp cams website. Very important.

Last edited by Vette5311; 09-19-2018 at 07:44 PM. Reason: Error
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Old 09-20-2018, 05:46 AM
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You need synthetic oil for two reasons:
1) The lubricity and reduced wear rate of synthetic oils (compared with regular oil) is MUCH better;
2) Synthetic oil won't "age" while it's just "waiting for summer".

If you feel you need to add zinc for a useful purpose, have at it. I think it's a waste of money for a stock-built '82 engine.
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Old 09-20-2018, 06:37 AM
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Originally Posted by slapjack9 View Post
In my eyes, synthetic can't hurt it. I run synthetic in mine and change it every thousand miles since it sits so much. I've also been told I way overdo things, so take that as you want
Yes sir, I too would agree that synthetic based engine oils can't hurt but I don't see them helping over and above a quality conventional engine oil in this particular scenario. This observation is based on a study we did several years ago for a major engine manufacturer. Oils were sampled twice a month (as I recall) and submitted for analysis. The study involved multiple engines over a two year period.
NOTE One important consideration for long-term vehicle storage is routinely starting the engine and bringing it to stabilized oil temperature.

Synthetic formulated engine oils, by definition Base Oils, are blended with API Group 3 and/or 4 base oils. These oils really start to demonstrate their performance qualities under adverse operating condition, e.g., high engine temps/thermal oxidation.

Diesel formulated engine oils do bring added ZDDP to the package and thus can affect the anti wear and oxidation properties. On the downside they can be more viscous. Higher viscosities are known to decrease power and increase operating temps. Both of these changes are relatively minor but measurable. In addition to SAE 15w40, there are also 10w30 and 5w40 diesel grades. The 10w30 oils are often blended with Gr 2 and 3 base oils and 5w40 with Gr 3 and 4, whereby placing them in "semi synthetic" and "full synthetic" categories, respectively.

I would also add there many engine and engine oil tech savvy folks on this forum and their advise is well noted.

Vic

Last edited by Kerz; 09-20-2018 at 06:38 AM.
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Old 09-20-2018, 07:47 AM
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My engine builder on my 78 L82 says to use Valvoline VR-1 20w-50 racing oil which I just changed to after having the Driven Breakin Oil in it for 1000 miles. I think it has even more ZDDP that the Rotella oils.

Also before the rebuild I used the Castrol 10w40 EXtra Mileage oil for many years. But this was with all original parts (cam etc) that had been well broken in with oils that had ZDDP in them.
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Old 09-20-2018, 08:16 AM
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I like your engine builder's thinking! Valvoline VR1
Vic
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Old 09-20-2018, 10:21 AM
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Douglas Mariani
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Originally Posted by Vette5311 View Post



Use an oil with ZDDP and or high zinc content. I lost 2 engines from flat cams before I got this figured out. Lot of controversy here and I'm not looking to start a fight just telling ya what happened to me. No I did not have excessive spring pressure. Yes the cam was broken in properly. Yada yada. Google it or check recommendations on the comp cams website. Very important.
I agree

Last edited by Douglas Mariani; 09-20-2018 at 10:22 AM.
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Old 09-20-2018, 11:33 AM
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Mobil one 15w 50. Has the most zinc/ phosphate and you can get 5 gallon jugs at walmart for less than $25. They list it as high performance oil for flat tappet

https://mobiloil.com/~/media/amer/us...pecs-guide.pdf


.

Last edited by Rescue Rogers; 09-20-2018 at 11:34 AM.
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Old 09-20-2018, 11:37 AM
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Default Good to know

I've been paying twice that for Valveoline racing.
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Old 09-20-2018, 11:40 AM
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Originally Posted by Rescue Rogers View Post
Mobil one 15w 50. Has the most zinc/ phosphate and you can get 5 gallon jugs at walmart for less than $25. They list it as high performance oil for flat tappet

https://mobiloil.com/~/media/amer/us...pecs-guide.pdf


.
That racing oil is thick, but has zinc at 1300 PPM. The other Walmart Mobil 1 choice is the 0w-40 euro-spec at 1100 PPM. This is what I use, though both are a strong buy when I'm at Walmart. I haven't seen the 0w-40 lately.
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Old 09-20-2018, 11:42 AM
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For summer, for a 1981 with flat tappets, I'd go with Penn Grade 1 in 15W40.

If you have a roller cam and roller lifters installed, you could go with just about any 15W40 (most are "diesel" oils, but that's fine for these engines).
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Old 09-20-2018, 04:55 PM
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Richard Cooper
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Thanks everyone. I went to Advance and got a 5 quart jug of Mobil 1 10W-30, full synthetic. It was on sale and not much more then the conventional oil.
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Old 09-20-2018, 05:22 PM
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Originally Posted by Richard Cooper View Post
Thanks everyone. I went to Advance and got a 5 quart jug of Mobil 1 10W-30, full synthetic. It was on sale and not much more then the conventional oil.
what was the API service rating. in the end that is all that maters, any thing else is hype and marketing
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Old 09-20-2018, 06:01 PM
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I have been using Brad Penn for years with no issues of any kind.

https://www.penngrade.com/about-us/

Cheers!
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Old 09-20-2018, 06:44 PM
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Originally Posted by Nowhere Man View Post
what was the API service rating. in the end that is all that maters, any thing else is hype and marketing
The API rating is GF-5,SN
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