There was also a post by a gentlemen who posted pics under the valve cover of an engine run exclusively on Mobil 1 with like 6K to 8K oil change intervals and it was varnished.
Again, I know you don't believe me, but I'm sure some of the old timers here remember that thread!!!! (it was a war...)
With the advent of GF-4 and GF-5, NO oil will leave varnish and deposits in the proper application. The testing is that tuff compared to GF-1 through GF-3.
Again, I know you don't believe me, but I'm sure some of the old timers here remember that thread!!!! (it was a war...)
With the advent of GF-4 and GF-5, NO oil will leave varnish and deposits in the proper application. The testing is that tuff compared to GF-1 through GF-3.