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Anyone run 10w40 in the summer?
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REDLINE
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PostPosted: Tue May 22, 2012 11:51 pm    Post subject:  Anyone run 10w40 in the summer? Reply with quote

I'm just curious if anyone runs 10w40 (synthetic or regular) at all in the summer as opposed to 10w30 year round in their 3800.

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PostPosted: Wed May 23, 2012 12:02 am    Post subject:   Reply with quote

Nope. I'm not even sure why you would do that. I'd consider using 5w30 if I lived in a super cold climate during the winter, but 10w30 is all I use these days.

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PostPosted: Wed May 23, 2012 7:16 am    Post subject:   Reply with quote

Not a good thing to do.
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PostPosted: Wed May 23, 2012 8:59 am    Post subject:   Reply with quote

Like the old saying goes, if it ain't broke, don't fix it...

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PostPosted: Wed May 23, 2012 9:16 am    Post subject:   Reply with quote

I run 5w-30 in all of my w-bodies

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PostPosted: Wed May 23, 2012 12:49 pm    Post subject:   Reply with quote

Yeah always fun the same viscosity all year round on my Imp. 5w-20? Can't remember. RP of course. Very Happy

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PostPosted: Wed May 23, 2012 4:10 pm    Post subject:   Reply with quote

This question came about because I was having a discussion about 3800s that leak, and a mechanic I know says he runs 10w40 in his higher mile 3800 vehicle. His no longer leaks though, as he has replaced every seal on the car. He feels it's okay to run the 10w40 though. I'm more inclined to believe 10w30 year round would be better, but wondered if full synthetic 10w40 would be fine as well.

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PostPosted: Wed May 23, 2012 6:46 pm    Post subject:   Reply with quote

I have 157k, never had an oil leak, since I owned it. (122k)
*Knock on wood*

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PostPosted: Wed May 23, 2012 10:24 pm    Post subject:   Reply with quote

I ran 10w40 full synthetic in an S-10 of mine with the 4.3L, but it had 200K miles on it. I also heard that running heavier oil in an older engine isn't bad because usually the tolerances are a little more worn. When I made the switch, the truck did feel like it gained more low-end torque, and it ran better. But then again, it was it's first synthetic oil change too, so that should be factored in. I guess what I'm saying is it isn't really bad for it, but I wouldn't switch it up unless you're engine doesn't leak, but you're using oil. Thicker oil doesn't get lost as fast, but it's just a band-aid on an old, worn out engine.

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PostPosted: Wed May 23, 2012 11:48 pm    Post subject:   Reply with quote

Jnibbs24 wrote:
I have 157k, never had an oil leak, since I owned it. (122k)
*Knock on wood*

You so and so fourth Mad Laughing Mine had a valve cover leak pretty bad. Got that taken care of and now it's leaking from somewhere else Bang Head
jmakinen wrote:
I ran 10w40 full synthetic in an S-10 of mine with the 4.3L, but it had 200K miles on it. I also heard that running heavier oil in an older engine isn't bad because usually the tolerances are a little more worn. When I made the switch, the truck did feel like it gained more low-end torque, and it ran better. But then again, it was it's first synthetic oil change too, so that should be factored in. I guess what I'm saying is it isn't really bad for it, but I wouldn't switch it up unless you're engine doesn't leak, but you're using oil. Thicker oil doesn't get lost as fast, but it's just a band-aid on an old, worn out engine.

Funny you should mention S10. While I wasn't thinking about it for the Impala, I wondered if it would slow a leak in the S10 I deal with, while bumping the oil psi up possibly. That motor is under 100k though, and the leak I don't think is easily fixed w/out really getting into the thing. Both vehicles do get synthetic now.

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PostPosted: Thu May 24, 2012 6:44 am    Post subject:   Reply with quote

Now that we're on that subject,my owners manual says 10W-30 (for a 3800 Code K V6) and the cap under the hood says 5W-30. This car just hit 30K miles,and unless some idiot somehow changed caps during an oil change,which I doubt...I'm curious about the discrepancy...? And/or what I should really be using,and if I should change from what's been put in it since I got it,,,2 changes ago. This is an '03 3.8 Series II V6.

Any feedback is welcomed as always.

Thanx

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PostPosted: Thu May 24, 2012 7:55 am    Post subject:   Reply with quote

patyson wrote:
Now that we're on that subject,my owners manual says 10W-30 (for a 3800 Code K V6) and the cap under the hood says 5W-30. This car just hit 30K miles,and unless some idiot somehow changed caps during an oil change,which I doubt...I'm curious about the discrepancy...? And/or what I should really be using,and if I should change from what's been put in it since I got it,,,2 changes ago. This is an '03 3.8 Series II V6.

Any feedback is welcomed as always.

Thanx


Either one is fine, in colder climates 5w-30 is better in the colder months, but in warmer climates you can do 10w-30 just fine

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PostPosted: Thu May 24, 2012 12:26 pm    Post subject:   Reply with quote

00impala123 wrote:

Either one is fine, in colder climates 5w-30 is better in the colder months, but in warmer climates you can do 10w-30 just fine


I believe there is a visual aid in the owners manual showing the recommended temperature ranges for 10w30 vs 5w30.

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PostPosted: Thu May 24, 2012 12:58 pm    Post subject:   Reply with quote

IffyG wrote:
00impala123 wrote:

Either one is fine, in colder climates 5w-30 is better in the colder months, but in warmer climates you can do 10w-30 just fine


I believe there is a visual aid in the owners manual showing the recommended temperature ranges for 10w30 vs 5w30.


Indeed there is. I don't have mine with me here but I am sure there is an indication of temperature ranges for oil weights.

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PostPosted: Thu May 24, 2012 1:05 pm    Post subject:   Reply with quote

It'll depend a lot on the specific oil, all 10w-40 oils are not the same.

I used to run RP 10w-30 but I believe they changed their formula over the past few years because i'm getting some metal shavings on my drain plug that weren't there before. I switched to M1 0w-30 for the winter because it only sees 3-4 cold starts to operating temp as I don't drive it. I will be switching to Castrol Edge 0w-30 for year round use. It has similar properties to a 10w-30 oil but it has way better viscosity for cold starts. You need to find the stuff that has "made in germany" printed on the bottle as it still includes Zinc and Phosphorus (anti-wear additives that aren't present in US made oils).

I run Castrol Edge 0w-30 year round in the STi (factory spec is 5w-30) and it LOVES it. Very little oil consumption...typical turbo subaru's use ~1 quart every 3k miles, I use less than 1/4 quart in 4.5k miles. I've been getting oil analysis reports done (one at a 3k mile change interval, and another at 4.5k miles) and they are both indicating less than normal wear with enough active protection left to potentially take my oil change to 6k miles. Although I think 5k miles will be a good stopping point. The 3800 should have no problems with it.

You might also want to look into M1 0w-40, same price and similar properties except it doesn't contain anywhere near the amount of Zinc and Phosphorus that the Castrol does.

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