If there is one HUGE advantage full synthetic oils have over semi or conventional oil it is Flow . Test after test , synthetics flow like water compared to the molasses like performance of conventionals . You have heard it time and time again that cold start up are the big cause of engine wear and that is why we had multi grade oils for decades now .
Motorcycle engines have overhead cam engines with chains operating them . When some one
starts a cold OHC engine and revs the bejezs out of it I can the cam bearings screeching . Drives me crazy .
My wife’s car has a chain ohc set up , they used to be a belt. I asked this trusted mechanic how come . His reply , the belts lasted longest until synthetics came into use . Now chains last longer and a good thing too. The chain on a Cadillac V8 is about 10 feet long and when she fails you’d better have a high limit on your credit card .
If you follow serious oil testing , you will see a common thread . Shell , Mobil and Delco . These tests are the ones watched by the big rig , long haul industry . They have no time for any he said , she said info , they just want the Science . They want an oil that will get 5.02 mpg rather than 4.99 and will get and engine to 825,000 km rather than 800,000 before a rebuild . I know 2 of these guys n my town , small operators, and they run 150 trucks each . I can’t imagine how many rigs the big fleets have on the road .
These big fleets are courted by the top oil companies sales staff with testing, testing , testing reports and low prices on huge containers product .
Furthermore , I finally did the math .
The 19$ 4 litre bottle of Shell at Wallyworld in Bangor works out to 4.75 U$ . The 5 litre container at Acadian Tire 38 C$ comes to 5.70 U$ . Not such a big difference if you assume it’s going towards health care
That’s all folks