Speaking of using or switching to synthetic oil, does anyone on the list know if
the synthetics use TBN and antioxidation additives in adequate quantity to
enable an extention of the engine oil change time interval to two years?  I
drive 3500 miles/year in each vehicle, and only rarely are they driven less than
10 miles at a stint.  I'd love to use synthetic oil but worry that acid
formation and oxidation could potentially harm my engines if I tried to extend
the drain interval to two years.  I could justify the added expense of a
synthetic oil if I could safely reduce the oil change frequency by 75%.

-Dana-

 . . .

> Recently switched to Mobil 1 15W50 and the problem has almost disappeared.
 . . .

> Sam Walters
> Baltimore

 . . .

> couple of noisy lifters.  Many have reported no lifter noise (or much less)
> with synthetics like Mobil 1.  Why? Because it flows much better cold.  My
 . . .
> filters.   If I ever put in a new engine,  I will definitely go to Mobil 1
> after the initial break in time.
>
> Jay
>
 . . .

> However I find I must be diligent about oil changes a filter changes.
>

> John Rodgers'
> 88 GL Driver