[Z06] Wrong oil?
Burning Brakes
Joined: Nov 2006
Posts: 1,071
Likes: 0
From: Goose Creek SC
Racer
Joined: Aug 2006
Posts: 488
Likes: 42
From: Valley Lee MD
Run it!
When I changed the oil in my Z the first time (purchased with 9,000 miles) I used RP 15W-40 since that is what I use in everything and I have it in bulk. So I dropped RP an email and asked if running the heavier weight 15W-40 oil would hurt anything. RP said no but would recommend using RP 5W-30 or RP RACING 21 oil. Of course I asked why. RP said that the heavier 15W-40 does not circulate as fast in the engine as the RACING 21, therefore, the 15W-40 does not absorb and disipate the heat as rapidly as the RACING 21. And it is all about getting the heat out of the bearings, etc..
Ed
Ed
Burning Brakes
Joined: Feb 2006
Posts: 1,205
Likes: 5
From: Jupiter FL
As long as it's the same brand of oil, absolutely no problem mixing it. Different brands use different combinations of additives, and mixing brands can change the effectiveness of additives. But one quart is probably not enough to hurt anything. If it was the same brand, the additive package is probably the same or very close to the same, so absolutely no problem.
Now go drive it like you stole it.
Now go drive it like you stole it.
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Burning Brakes
Joined: Sep 2004
Posts: 757
Likes: 2
From: Orlando Fl
I've talked to a Volvo engineer and all oils are made to be compatible. Goverment regulation. Also if you wanted "some" synthetic protection, the so called "blends", all you have to do is add a quart of synthetic to your regular oil. In the vettes or other high performance just put all synthetic.
Best Regards-
John
Best Regards-
John
Melting Slicks
Joined: Oct 2000
Posts: 2,491
Likes: 1
From: prescott AZ
With Mobil 1's OK I run a 7 1/2 x 30 as they said it was OK to run 3 1/2 qts of 5-30 and 3 1/2 qts of 10-30. I just do not like a 5-30 oil and this is as close to it as I will go for winter driving. In summer I use a only 10-30.
Burning Brakes
Joined: Nov 2006
Posts: 1,071
Likes: 0
From: Goose Creek SC
So basically, you are actually slightly thinning out your 5w-30 at operating temperature when you are mixing these two because you now end up with around a 10.5cSt product. Will it hurt you, probably not one bit. But non the less, you are mistaken in your end desired results.
Hammer
Last edited by thehammer69; Feb 14, 2007 at 01:43 PM. Reason: Bad spelling
Le Mans Master
Joined: Aug 2005
Posts: 7,201
Likes: 0
From: DP(oh you know where) IL
St. Jude Donor '06
I'm not against mixing oil...I've done it myself. But you are making a mistake here. Believe it or not, Mobil-1 5w-30 is actually THICKER at operating temp than 10w-30. Let's focus on the "30" number for a second. That is the SAE viscosity rating for when the oil temperature is 212F/100C. Ok, now understand that a SAE 30 visocosity has approximately a 9.5 cSt-12.6 cSt visocosity range....So basically there can be close to 3 cSt variance in visocosity and still be called a SAE 30. Well here's the thing, Mobil-1 5w-30 runs higher in this range than 10w-30 at operatingf temp. You see, if you take time to read the Product Data Sheets (PDS) on both these Mobil-1 oils, you will find that the 10w-30 runs close to 10cSt while the 5w-30 runs at around 11 cSt.
So basically, you are actually slightly thinning out your 5w-30 at operating temperature when you are mixing these two because you now end up with around a 10.5cSt product. Will it hurt you, probably not one bit. But non the less, you are mistaken in your end desired results.
Hammer
So basically, you are actually slightly thinning out your 5w-30 at operating temperature when you are mixing these two because you now end up with around a 10.5cSt product. Will it hurt you, probably not one bit. But non the less, you are mistaken in your end desired results.
Hammer