[Gary Knox]

Not going to state an opinion one way or the other on this, but after decades of religiously changing oil on a 12 month basis, even with 1K -3K mileage, over the past few years I've occasionally gone a couple of years with cars that I'm driving less than 1.5K per year, have top grade pure synthetic oil installed, and are always garaged..

Anyway, I did find the testing and the results interesting.

Gary

[Bertrand Daoust]

I change the oil in the 928 every two years.
I do about 5k kms each year. May to October.
I change it last year (April) but only put about 2k since.

[worf]

Yaw’ll saw my post on ToS.

Doug Hillary’s oil analysis reports showed that M1 was actually arguably slightly better than new after a couple of thousand miles.