I usually go to Firestone and have them do a Synthetic Kendall Blend on my 03' Suburban with 217k Miles - every 3k-5k miles - I try to keep it closer to 3k because of the high mileage - it leaks some oil out the rear main too but not too bad really
I also use the Firestone Synthetic Blend on the 07 Silverado with 84k miles - no complaints so far.
I did just buy a 03' SAAB with 104k miles and Plan to only use Mobil 1 Synthetic as that is what is suggested when I pop the hood.
Any complaints with my plan?
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