Dumb oil question

[Jim R.]

I see that some guy's are using rotella t 15 40 oil, i guess because of the zinc thing, this is also the oil that my engine builder said to use, so here is my dumb question ,can we use say( synthetic 10-30 )in our older engines. does syn have the protection needed for us.

[Terry D.]

Re: Dumb oil question

Jim
There are numerous articles in the archives on this subject. There was also a story in the summer of 2008 Restorer by Duke Williams on the subject. Let your figures do the walking.
Terry

[Michael W.]

Re: Dumb oil question

Yes, you can use certain synthetics under certain circumstances, but the questions I would ask is why would you want to?

It's a lot of extra money for no gain.

[Duke W.]

Re: Dumb oil question

Read the referenced article. "Synthetic" versus "conventional" or 10W30 versus 15W-40 are secondary issues in oil selection.

It's all about the API service category.

Duke

[Dick W.]

Re: Dumb oil question

A guarantee that comes with synthetics, it will find places to leak that have never leaked before.

[Kenneth H.]

Re: Dumb oil question

The last oil change on my 2001 Tahoe the mechanic advised going to synthetic. Never had any oil leaks. A few months later I spotted some oil drips on my driveway where I parked the Tahoe. Took the car in for inspection and service and needed a new manifold gasket. Not cheap. You decide.

[Joe R.]

Re: Dumb oil question

I've been reading the board on this topic for awhile. CJ-4 is the recommendation I've seen and will use. Here's a pretty good post on the subject:

https://www.forums.ncrs.org/showthre...=cj-4&uid=3647

Joe