Is synthetic oil okay to use in older model 400 small block engines?

Answer 1

Why would it not? Depending on the car and the motor I would use it exclusively. Having built my fair share of motors it's the only thing I use anymore in the cars I restore. It will help them in the long run. I use Mobile One in the motors I rebuild and anyone who I have done work for on their classics knows I only run Mobile One synthetic. In fact I have had it take lifter tap out of motors before. The Viscosity holds better, it stays cleaner longer and it flows faster then conventional oil at start up and when it's cold. Yes it is ok and I recommend it.

Answer 2

Synthetic oils are safe to use. They are more expensive, but need to be changed less frequently. The big question would be does the motor leak oil, and if so would it be feasible to use synthetic oil. You can good quit a while without changing to oil. Amsol can go for 12,500 miles, change the filter,retop and run another 12,500.

Answer 3

It's okay, but even if you don't have a leak now, you might after switching to synthetic--it's been known to slip past seals that regular oil can't. Try it and see. You can always switch back.

Answer 4

if you do make sure it is full synthetic other wise the half synthetic will cause a oil leak, it will clean around your seals and gaskets and leak where slug and other crap was sitting.

Answer 5

about the only engines i don't recommend synthetic for is clapped out leakers, if you consume more than 1.5 L between changes, the cost might not be worth it.

Answer 6

It's great but it's also a waste of money.
You just need regular oil.

Answer 7

in any motor old new or otherwise, 27 years motor builder