Anyone here use 10w30 synthetic in 4.7? - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 22 (permalink) Old 05-13-2015, 12:01 PM Thread Starter
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Anyone here use 10w30 synthetic in 4.7?

Was just wondering if using 10w30 Mobil 1 in the summer months (South La) would be ok?

'06 silver 4.7 4x4, 2" Rough Country lift, 265/70/17 Goodyear Wrangler Duratracs, 17 x 8.5 MB V-Drive wheels, AEM Brute Force CAI, Optima Red Top, Bilstein HD struts up front, and a couple really cool stickers that add somewhere between 10-13 HP
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post #2 of 22 (permalink) Old 05-13-2015, 12:51 PM
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Why would you do that?

You have it already or something? There isn't an advantage that I can think of.
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post #3 of 22 (permalink) Old 05-13-2015, 01:11 PM Thread Starter
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Quote:
Originally Posted by luckyse7ens View Post
Why would you do that?

You have it already or something? There isn't an advantage that I can think of.
I could be completely wrong about this (yes i put it in yesterday)but I thought it may help with this very small oil leak I have. It never drops to the ground....ever, but leaks over my starter and the surrounding area. Plus the fact that it's so hot already and that when at operating temp it's still 30 weight, i figured the little bit thicker oil might quieten down my old motor a bit and possibly stop the leak.

'06 silver 4.7 4x4, 2" Rough Country lift, 265/70/17 Goodyear Wrangler Duratracs, 17 x 8.5 MB V-Drive wheels, AEM Brute Force CAI, Optima Red Top, Bilstein HD struts up front, and a couple really cool stickers that add somewhere between 10-13 HP
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post #4 of 22 (permalink) Old 05-13-2015, 01:22 PM
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Have you tried something like this :

https://mobiloil.com/en/motor-oils/m...1-high-mileage

in the proper weight?

I doubt you'll hurt anything, IIRC the 05-07 engines called for 5w30 and they switched to 5w20 to save a small bit of gas mileage in the later model years.
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post #5 of 22 (permalink) Old 05-13-2015, 01:27 PM Thread Starter
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Quote:
Originally Posted by luckyse7ens View Post
Have you tried something like this :

https://mobiloil.com/en/motor-oils/m...1-high-mileage

in the proper weight?

I doubt you'll hurt anything, IIRC the 05-07 engines called for 5w30 and they switched to 5w20 to save a small bit of gas mileage in the later model years.
My apologies, I should've mentioned that I have been using the HM Mobil 1 5w30 since about 80k. I'm right at 100k now. I may get a torque wrench and go over all of the valve cover bolts. I should have thought to do that before the heavier oil I suppose.

'06 silver 4.7 4x4, 2" Rough Country lift, 265/70/17 Goodyear Wrangler Duratracs, 17 x 8.5 MB V-Drive wheels, AEM Brute Force CAI, Optima Red Top, Bilstein HD struts up front, and a couple really cool stickers that add somewhere between 10-13 HP
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post #6 of 22 (permalink) Old 05-13-2015, 01:30 PM Thread Starter
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Does anyone think I'll actually HURT anything with the 10w30 during the summer or should I drain the brand new 10w30?

'06 silver 4.7 4x4, 2" Rough Country lift, 265/70/17 Goodyear Wrangler Duratracs, 17 x 8.5 MB V-Drive wheels, AEM Brute Force CAI, Optima Red Top, Bilstein HD struts up front, and a couple really cool stickers that add somewhere between 10-13 HP
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post #7 of 22 (permalink) Old 05-13-2015, 02:09 PM
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Quote:
Originally Posted by Danny View Post
My apologies, I should've mentioned that I have been using the HM Mobil 1 5w30 since about 80k. I'm right at 100k now. I may get a torque wrench and go over all of the valve cover bolts. I should have thought to do that before the heavier oil I suppose.
Yeah, I wouldn't personally go to a heavier oil to fix a leak. I am @ 105k with no leaks.

Honestly 10w30 should be fine in the summer, or in the winter in LA.
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post #8 of 22 (permalink) Old 05-13-2015, 04:22 PM
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The 10w30 is not actually heavier weight oil than the 5W30. The frst number before the W indicates the weight of the oil when it is cold to indicate flowability in really cold temperatures. The second number (30 in this case) indicates weight when the oil is warm or hot. In this case the oil is the same weight when hot so there is no difference in weight between 5W30 and 10W30 when the oil is hot.

You are just fine with the 10W30 - you won't hurt a thing. I doubt that changing oil will help with the oil drip however.

Dan
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post #9 of 22 (permalink) Old 05-13-2015, 05:46 PM
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Quote:
Originally Posted by bdalameda View Post
The 10w30 is not actually heavier weight oil than the 5W30. The frst number before the W indicates the weight of the oil when it is cold to indicate flowability in really cold temperatures. The second number (30 in this case) indicates weight when the oil is warm or hot. In this case the oil is the same weight when hot so there is no difference in weight between 5W30 and 10W30 when the oil is hot.

You are just fine with the 10W30 - you won't hurt a thing. I doubt that changing oil will help with the oil drip however.

Dan
True on both accounts.
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post #10 of 22 (permalink) Old 05-13-2015, 06:40 PM Thread Starter
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Thanks guys. I appreciate the feedback. I'll try and re torque those valve cover bolts and see what happens. I have right at 100k and they might have backed off a teeny bit. If not, I'll just deal with it. The leak is so minor it doesn't really even appear to show on the dipstick until around 3k miles and then it takes less that a fourth of a quart to top it off. I already have the new gaskets in case it worsens but right now the juice isn't worth the squeeze, lol.
Thanks.

'06 silver 4.7 4x4, 2" Rough Country lift, 265/70/17 Goodyear Wrangler Duratracs, 17 x 8.5 MB V-Drive wheels, AEM Brute Force CAI, Optima Red Top, Bilstein HD struts up front, and a couple really cool stickers that add somewhere between 10-13 HP
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