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Old 02-26-2019, 01:47 PM   #11
10scDust
Senior Member
 
Brand: Thor Motor Coach
Model: 2016 Thor Outlaw 29H
State: Tennessee
Posts: 668
THOR #13869
I would say so long as it meets the SAE severity ratings & viscosity, it should be fine to use synthetics.

The little I remember being taught about oils, in a multi-grade, it is man made polymers mixed into the oil (being straight weight to begin with), that makes it thicken its viscosity as its temperature rises, (the polymers binding together to force the oil to thicken).
Oil, will lose viscosity when its temperature gets hotter.
So,
In my honest opinion, and I am not the expert, since it is man made polymers in the mix, making it multi-grade viscosity oil, does that not make it semi synthetic?
Even though not advertised as such.

I remember our instructor, who engineered at Mobile Oil told us; that it is not recommended to mix different manufacturer's multi-grade oils, with others', as the polymers may not cohabitate equally while mixed and heated together.

This was 30+ years ago in a hydraulics class.
Things may be different now a days, but it was food for thought for a young apprentice.

I admit, I have needed a quart, while on the road, bought what was on the shelf to add to the engine, and I never experienced a problem, knowing full well it was different from what was in there.
But todays vehicles are built with tighter tolerances, and qualities are better.

I digress, just thought this will add...
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Rusty
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