Quote:
Originally Posted by JCL
Haven't used it myself.
The standard Mobil 1 meets higher specs according to the Mobil 1 product data sheets.
High Mileage 5w-30 appears to have more detergents, and is recommended for cleaning up engines that have been running on non-synthetic oil, particularly when doing consecutive hot flushes to clean out an engine.
I would stay with the standard product.
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i used it on an oil change this spring, and plan to use that or castrol high mileage this fall/winter oil change. my hope too was that it will condition seals and maybe slow some leaking. (and it seemed to, but maybe it was in my head. i was unable to verify cause i did not drain the oil last)
when my tranny was rebuilt, which is still good, they had to drain the oil and they changed the rear main seal... i asked them to put mobil 1 5w-30 in and i'm sure they did... not the high mileage stuff and i haven't seen much oil loss prob cause of the new rear main. but i want to go with a high mileage oil.