I switched to Valvoline high mileage oil around 110k due to oil seepage from the bottom gasket on the engine - Valvoline high mileage probably stopped it
Then might have used syn blend with high mileage and also just full syn
Last two yrs went to Firestone and they used Kendall on the recommendation of a very good Honda m/c. Firestone no longer does Kendall. BTW, if Kendall (syn blend) how many miles before another oil change assuming short distance drives?
So wondering what to use - wondering if Castrol high mileage is better than Valvoline? A m/c at Pepboys tells me that you put high mileage between 100k-150k and then go full synthetic - if this is correct, I am thinking of using Mobil1 Full Syn. Do I still use the OEM spec of 10W 40 oil?
When I searched Kragen, this is what I got: