Hey Scotty, I just have a quick question about oil types. My truck uses regular full synthetic oil. Could switching over to High Mileage Full Synthetic cause a slight leak at gaskets? Thanks.
High mileage oil contains additives that cause slight swelling of the seals. The idea is that if you have old/worn seals that leak slightly, the high mileage oil can reduce leakage as a stop-gap measure.
If anything the high mileage oil should reduce not increase leakage. However, if the additives do something good they can do something bad.
I’d probably go back to regular synthetic, but I think it probably won’t make much difference either way. If you have leaks, sooner or later you’ll need to correct them.
good luck!
I'm not really sold on high mileage blends. I'd keep using the regular synthetic.
If you’ve been changing the engine oil diligently (every 5,000 miles), just stick to the synthetic oil you’ve been using (same viscosity and brand).
Change the oil more frequently gives you a better outcome than using high mileage oil.
