| Re: Oil Pressure Poll [message #366625 is a reply to message #366554] |
Thu, 09 September 2021 08:49  |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
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I have run only Shell T6 (Blue jug) full synthetic since my Cinnabar engine was installed. This is a 5W-40 oil that was branded as for both Diesel/Gasoline engines. Recently Shell marketed Rotella Gas Truck full synthetic (Red Jug) oil and removed the gasoline icon from T6 . Did they make it not for gasoline or just want to sell the new Gas Truck Rotella syn? Can only guess. I asked Dick Patterson about my oil choice and he highly praised the T6. Fall camping we have woken to teens F and have effortless starts, whereas earlier in trip we were in the 90s. This wide range as Larry suggests is good at outsmarting Mother Nature. Now the wider the viscosity spread, the more viscosity modifiers they have to use to accomplish this. That’s not desirable as the viscosity modifiers can break down before other oil components. Example: My 80s Buick manual recommends 10W-30, but 5W-30 when temps expected below zero. Why not just run 5W-30 year round as both are 30 hot? Because of the viscosity modifiers noted above, less spread is better in summer. However— with synthetics the wide spreads are rated without excessive viscosity modifiers being necessary so a win win. Since I only carry one oil type on board, I run only T6 in the Onan as well. Some claim of ‘glassy deposits’ in air cooled engines from synthetics, but my Onan has never let me down so that’s my benchmark.
John Lebetski
Woodstock, IL
77 Eleganza II
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