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Discussion Starter · #1 ·
would there be any harm running 10 30 syn for the summers it gets so hot here curious? thanks car has been on synthetic for some time now and it has 100,000 miles. usually gets 5 30
 

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Re: oil for s70 t5 (csc23)

What year? And what are you running right now? 5W-30?

I think the manual states that 10W-30 is what to use, not sure. But yea, if you live and drive where it gets pretty hot constantly, definitely not a bad idea to go with the slightly heavier weight.
 

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10w-30 Mobil 1 synthetic is what I use when I'm in NY for the spring through fall. Back when the car was driven in Maine winters I used a 5w-30.

Here in southern Sweden the dealers use 5w-40 and I follow suit with a synthetic one...in northern Sweden I think people run a 0w-30 in the colder months.
 

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Re: (Big Will)

But the summers there are still much cooler than most of the US,
10w30 for me in the summer http://********************/smile/emthup.gif
 

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Re: (JRL)

I use the same oil year around. The upper number is the operative one when the oil is hot. I like the 5W-40 number spread (Amsoil in this case), but I've used M1 5W-30 too. Nothing wrong with that.
The lower number kinda goes with what your personal philosophy about oil is.
Believing oils are much better than they were even 10 years ago, I think a lower low-number flows faster and better on a cold start. You may believe a higher low-number coats parts better for cold-start protection.
I don't think you can go wrong either way, as long as you use a synthetic.
 

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Re: oil for s70 t5 (csc23)

Mobil 1 10-30 every 5 k miles in summer- I may go to 5-30 for winter months.
 

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Re: oil for s70 t5 (Wayne T5)

Quote, originally posted by Wayne T5 »
Mobil 1 10-30 every 5 k miles in summer- I may go to 5-30 for winter months.
That's exactly what I do.
 

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Re: oil for s70 t5 (MadeInJapan)

10W-30 Mobil 1 synthetic year around for me.
 
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