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Originally Posted by '85 fairlady
what would one use then?
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Theres a few schools of thought to this answer. One way I have heard of is to add a 1/4 to 1/2 a quart of auto trans fluid run it for a while and drain it. If left too long the trans fluid can affect the seals , so it's best to drain it after a few hours of running.
Another way is to use one of the oil cleaners from the autoparts store , but those in the know don't care for that approach , among other things it puts main and con bearings at risk. The solvent used is 1/10 as hydro-dynamic as even water and also turns oil into a mere shadow of it's former viscosity. I'd use this only in dire situations where oil galley clogging is a probability.
You can use a much lighter weight oil for a short time , such as
0W30 (Mobil) , or even
5W30 , but I wouldn't go driving and boosting (those of us
with boost
) on such light weight oil.
Or , you can use a full synthetic oil , they have great detergent properties , but tend to clean seals out so well that the older ones on cars such as ours can spring leaks.