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Discussion Starter #1
hello guys,
I need to add like 1/4 of mobil1 5W-50 to the oil already in the engine (mobil1 15W-50)? do you see a problem in mixing different oil numbers. (both are 100% synthetic).
 

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tehaurai said:
hello guys,
I need to add like 1/4 of mobil1 5W-50 to the oil already in the engine (mobil1 15W-50)? do you see a problem in mixing different oil numbers. (both are 100% synthetic).
Hey Welcome! What year are you driving? Because Different years require different viscosity. I am not an engineer however Why would you want to mix viscosities? :confused:
 

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Discussion Starter #3
driving a 2005. The fact is we don't have choice here in Tahiti. we only have a few oil numbers. But thanks any way, the tech just answered my question : you do not want to mix oil numbers, you need to service first.
 

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Sure you can mix different weights of oil. The viscosity modifiers in oil are basically low levels of rubber. Not the highly cross linked stuff in tires but still a "rubber". Heck, I've even made some of them as part of a research effort with Lubrizol. http://www.lubrizol.com/PasCar/default.asp

Lubrizol says said:
"We invented most of the components used in today's motor oils and our components are compatible with the widest range of the world's base oils."
I think the issue would fall back on why would you do it? I wouldn't do it as a habit but people mix viscosities every time they top off. You don't think 10W-30 is still 10W-30 after a few thousand miles do you?
 

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Discussion Starter #5
In fact my problem is i need to add like 1/4 oil to the engine before racing day (recommandations of the tech because of the paxton using the same oil circuit as the engine. Do not ask me why ..... i don't know..... just following his advice). and as far as we little islanders of Tahiti do not have much choice concerning oil numbers, the only numbers i can buy here is mobil1 5W-50. That is why i asked if i could pour some over the original mobil1 15W-50 already in the engine/paxton circuit.

As the tech answered : you do not wanna do that, just do an oil service and start over with new numbers .... no mixing.

My question now is : do i have to care about a special procedure for the paxton when servicing the engine oil ?????
 
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