Best oil plz help - Lexus ISF / IS-F / LFA / LF-A Forum
 
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post #1 of 8 Old 08-31-2011, 12:43 PM Thread Starter
AKS
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Best oil plz help

Hi @ll

i have a question >>>

i want to know what is the best oil for hpot weather (( above 40C))

and for the engines with high performance>>>


thanx a lot ^____^
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post #2 of 8 Old 08-31-2011, 12:50 PM
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I always use Amsoil and go with the correct weight according to the manual.

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post #3 of 8 Old 08-31-2011, 01:48 PM
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I have used Mobil1 Synthetic consistently. No issues here at all and we are in Texas. 60 days of 100+ days

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post #4 of 8 Old 09-01-2011, 05:12 AM
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Isn't the ambient temperature only important for starting? Once an engine reaches operating temperature, the outside temp should matter much, right? An engine at zero degrees outside won't be 40 degrees cooler internally than one at 40 degrees outside, right?

2011 MM, Passport 9500ix
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post #5 of 8 Old 09-01-2011, 08:02 PM
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post #6 of 8 Old 09-01-2011, 08:52 PM
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Quote:
Originally Posted by GrandPap View Post
Isn't the ambient temperature only important for starting? Once an engine reaches operating temperature, the outside temp should matter much, right? An engine at zero degrees outside won't be 40 degrees cooler internally than one at 40 degrees outside, right?
Wow. I haven't thought this hard about something for quite a while. let first of all preface my following statements with I am not a mechanic or engineer, just someone who thinks they know everything about everything.I would have to say that for the most part you are right. The operating temp is much higher than 40c/104f, and with that thought in mind the ambient temp shouldn't make much difference. BUT, with a higher outside temp the cooling system would have to work that much harder to keep the engine within normal operating temps, thus it is concievable that at higher ambient temps the engine won't cool as much. Case in point is that when driving the car in cooler weather and shutting off everything is off, but when driving the car in extreme heat and shutting off the cooling fan remains running for a bit to cool the engine. That would make me think that the engine is running at a higher temp in hotter weather.

whew...my head hurts. I think most of my rambling makes some sense, but who knows, I'm really the only one other than my 4 and 8 year olds that think I know everything about everything

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post #7 of 8 Old 09-01-2011, 08:58 PM
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@ OP...Sorry didn't mean to thread jack.

To answer your question, I would be inclined to say any good synthetic at the right viscosity/weight should be just fine. I'm with Abyars on this, I like Mobile1. Been running it since the first oil change and can't complain.

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post #8 of 8 Old 09-02-2011, 07:29 PM
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Motul 8100 5W40 in winter and 300V in summer/track for me...
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