My most recent change is with Magnatec 5W-30, the dexos1 gen 2 flavor. I tend to run 6-month OCIs, but I still have some Blackstone sample bottles, so I'll try to get an oil analysis done in July.
I've been a Castrol fan too since the '80s, when I used to do my own changes. GTX was what I used in the Ford Maverick ("Made for today's smaller engines!") and the big Mercury Park Lane. Edge did not do well in my 3.8 Buick Park Avenue, it leaked too much, but that was ca. 10 years ago.
I've been a Castrol fan too since the '80s, when I used to do my own changes. GTX was what I used in the Ford Maverick ("Made for today's smaller engines!") and the big Mercury Park Lane. Edge did not do well in my 3.8 Buick Park Avenue, it leaked too much, but that was ca. 10 years ago.