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5-30 or 10-30 oil For Over 100k Miles???

 
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Old 03 Nov 2010, 12:15 pm
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Default 5-30 or 10-30 oil For Over 100k Miles???

The dealer said I should use 5-30 (they did not have 10-30 in the high priced crap he was trying to sell me), but the manual says 10-30 since I live in Texas and it never gets below 30 degrees here. I use synthetic oil and have 100k miles on the motor.

What is your experience on the best grade of oil or does it matter? For some reason I think the dealer was trying to sell me the high priced stuff in the only grade they have.
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Old 03 Nov 2010, 08:29 pm
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Default Re: 5-30 or 10-30 oil For Over 100k Miles???

The 10w30 will help fill (cushion) any looser tolerances that will have naturally occured to any vehicle with that many miles. I live in Florida and use Amsoil 10w40 year round.

Jerry
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Old 03 Nov 2010, 10:05 pm
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Default Re: 5-30 or 10-30 oil For Over 100k Miles???

my simple advise, is to go for it. The hotter outside, generally the more liquid (thin) the oil.
If you see your engine loses too much oil over time, add some additives or add more heavy oil.
Especially now that the winter is coming in, it won't be much different from 10-30 oil used in the summer.
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Old 04 Nov 2010, 02:24 am
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Default Re: 5-30 or 10-30 oil For Over 100k Miles???

Use the 10w30. 5w30 would be way too thin for your climate.
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Old 04 Nov 2010, 07:51 am
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Default Re: 5-30 or 10-30 oil For Over 100k Miles???

I always add a quart of Lucus Oil additive on all my car's I cant prove it helps but i cant see it hurting and they make it is a full synthetic
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Old 04 Nov 2010, 12:00 pm
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Default Re: 5-30 or 10-30 oil For Over 100k Miles???

Definitely go with the 10w-30, or even 10w 40 for Texas climate and 1000,000 miles +.
Synthetic is worth the extra $.
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Old 04 Nov 2010, 12:38 pm
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Default Re: 5-30 or 10-30 oil For Over 100k Miles???

I've tried 10-40 on a Mazda Milennia of 1996 (V6, sports engine),and it seriously decreased performance,even in hot South Florida Miami summer weather.
The oil definitely is too thick for an engine and recommended for diesel engines (which make low RPMs).
10-30 is the perfect oil, even for summer. 5-30 is good for new cars, and in colder climates,but that doesn't mean it won't work for older engines.

You can always add 4-6oz of motorhoney to the 5-30 oil.

On the other hand, I really don't care about brand of oil. Any synthetic oil is fine.
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Old 04 Nov 2010, 01:32 pm
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Default Re: 5-30 or 10-30 oil For Over 100k Miles???

ProDigit your last responce to this thread confirms my suspicions about you from your first thread here at this site. I won't be wasteing my time replying to any more of your threads. BYE BYE.

You'll notice I put this as nicely as I possably could. Not at all what I would have liked to have said.

Jerry
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