VITIV Coupe

Not sure if this has been brought up before but I bought Mobile 1 Synthetic on sale and put it in my 64, 327/365. I have maybe put 50 miles on it and now I have been told to get ride of the synthetic because it really doesn't do anything for an old engine and plus, being so thin, it has a tendency to leak past seals and gaskets much easier. Should I leave it in or dump it and put the dino (Quaker State 10w-30) oil in it.

rtruman

I don't think its worth it at this point I also heard the same thing from different people leaks. It didn't hurt it, I would go with regular oil .

65GGvert

If I bought it from you, I'd dump it and run Shell Rotella (CJ4).

movinup

If this is a new engine I would get rid of the synthetic, since it will prevent the engine from breaking in. I use the 10w 30 Rotella with a break in additive for the first 500 miles before changing it back to the 10w 30 with out the additive.

capevettes

Pop Chevy

That's what I'm running in my 60 ! I don't know what you guys are afraid of ?

Easy Rhino

I seem to recall reading that the new synthetic oil in an old engine causing seals to fail is not accurate, but what do I know?

I would be more concerned about the amount (lack?) of zinc if you have solid lifters (365hp), and possibly not breaking in well.

Mike Ward

The truth. Myths are much more fun.

Boyan

Yes its been discussed a million times. You need to run an oil with zinc in it. Any diesel oil marked CJ4 or vintage type oil like Brad Penn. If you dont, you run the risk of your cam going flat. I know of several guys whom this has happened to.
Boyan

RatDog

I have Mobil 1 Synthetic 15W-50 in my '67 L79. I order it online from Wal-Mart and pick it up at the store for $22.66 for a 5 quart jug.

The Shell Rotella CJ4 oil appears to be more expensive but my car still has its original engine so I have an open mind on this and could be convinced to change if I'm risking harm to my engine.

-- Steve

Boyan

You are not risking harm, you are DOING harm to your engine. I dont know why its so hard to convince people to spend $25 more a year to protect a $50,000 piece of equipment/investment
Boyan

RatDog

I certainly don't have a problem paying more for oil. However, I thought the Mobil 1 with 1,200-1,300 ZDDP was a proper choice.

Where have I gone wrong in my thinking?

Thanks,
-- Steve

jim lockwood

You haven't. If the Mobil 1 has that level of ZDDP, it's perfectly adequate for your engine.

There is such a thing as too much ZDDP, though. At too high a level, an obscure form of corrosion begins to occur. (No, I don't know how much is "too much".)

Jim

jim lockwood

This is not true.

See the car in my avatar? All it's ever had in its engine is synthetic. Never a problem with breaking in the engine.

Break in procedure consists of 50 miles of medium speed driving followed by an oil change. Then it's wide-open-throttle racing after that.

Regular analysis of oil samples have consistently confirmed the internal health of the engine.

Jim

Boyan

[QUOTE=RatDog;1587728800]I certainly don't have a problem paying more for oil. However, I thought the Mobil 1 with 1,200-1,300 ZDDP was a proper choice.

According to The Mobil website, the only product that has 1200 ppm is Mobil 1 15W50.....if thats what you are running then you are fine.
Boyan

RatDog

[QUOTE=Boyan;1587729518]Boyan - Yes sir, that's the stuff I have in there.

-- Steve

John BX NY

I agree also. When I had Mobil 1 in my 67 L79 and noticed more oil than usual on my garage floor.

Frankie the Fink

I run Mobil 1 15W-50W and have for near 10 years now in the '61 and its in the new '63 too...its a special formulation for flat tappet cars. It will not harm your engine and has the appropriate amount of ZDDP.

Synthetic oil will NOT make your car "leak more".

Don't listen to all the horsepoo.

MarkC

I run Amsoil ZRod, it's loaded with ZDDP. In fact I will be ordering some shortly. I was talking to the Joe Gibbs guys at Carlisle and they have some really good oil for both the LS engines as well as the flat tappet engines. I may switch to Joe Gibbs LS30 for my Z06.

Steve439

I'm also switching to their oil.
I like the idea of the storage protection additive in their Hot Rod oil.