On Monday, March 22, 2021 at 1:50:40 PM UTC-4, mike wrote:

I'm not complaining or even asking whether the $25/10 quarts Kirkland fully
synthetic 5W30 SP oil is good or not as I know all about synthetic oil
advantages & disadvantages over conventional gasoline engine motor oils.

I'm just asking if you've also found it hard to find conventional oil by the
case at good prices (which means at your local Costco or department store)?

My VW came with dire warnings not to put anything but the recommended dealer oil in. But it's new enough not to leak down, so not a worry for a while.

Conventional and synthetic oils both start with the same raw dino juice though. The only difference is in the refining. Both have a range of different molecular weight oils, but the synthetic has a much tighter range.


Synthetics are superior to conventional oils. I've witnessed testing
and the difference is amazing. The test i saw showed a small engine
seizing on conventional oil at 5000 rpm but would run forever on
synthetic at 8000 rpm.