What size wrench to remove oil drain plug, 2003 8.1 ?

[RVDriver]

Subject says it, what size wrench to remove oil drain plug? 9/16 too small, 5/8 to big, and could not find metric to fit. Used a 5/8 six sided and it worked, but it was a sloppy fit.

[RVDriver]

Subject says it, what size wrench to remove oil drain plug? 9/16 too small, 5/8 to big, and could not find metric to fit. Used a 5/8 six sided and it worked, but it was a sloppy fit.

[dieselclacker]

Might try a 15MM. A 14mm which is really close to 9/16 works on my 2003 8.1. Make sure you don't have any burrs on the plug that might prevent wrench or socket from going on.

Dieselclacker

[Mutha]

Most all late model (1996 and up) GM engines
use a 15mm hex head on the oil drain plug.

Glenn

[JCM]

15mm it is.

[Max Hubrich]

Mine is a 15mm or, if you can find one, 19/32".

[depchief]

15mm it is. If you are going to change, better take a short extension bar under with you to help loosen the plug. They can get very tight if the last person used extra effort to tightened the plug

[DriVer]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by depchief:
They can get very tight if the last person used extra effort to tightened the plug </div></BLOCKQUOTE>Now want a minit' I resemble that remark!

[edgray]

I think I detect a pattern emerging here. I'm remembering an episode involving an oil filter a while back? ED

[lawdude]

I have a sad Oil Change tail for you all.

In 1981 I purchased a 24' Class "C" Lindy rig on a Chevy base.

After the first run, I decided to change the break-in oil and do as the manual suggested. But, being a real handy sort (back in those days) I opted to do it myself.

Draining wasn't a problem but I had problems taking the oil filter off. I even enlisted my super-mechanic next door neighbor.

To make the long, sad story short, we/he ended up breaking the seal mating surface and it would not hold oil. That surface was machined into the block. I towed it to the selling dealer and they just said TS customer...replace the block.

Needless to say that was not acceptable but their head honcho mechanic (a fellow that couldn't come clean if submerged in de-greaser for 6 months) said he had an idea.

I left my poor ol' baby in his hands and waited.

The next day, he called and said, "Come get it!" He had used an epoxy material and molded it to replace the metal knocked out. (the piece measured about 1 1/2 inches by 1", curved)

It sealed like a champ and when I sold it to a friend 4 years later (w/80,000 miles) he kept it for at least 5-6 years and never lost a drop of oil!

It turned out the reason the filter was so hard to get off was that the rig was stored near salt water and the threads had NEVER been oiled. The filter had rusted into place and even when we sectioned it and looked at a cross section under a very good, lab quality microscope, you couldn't tell where the block began and the filter threads began.

Last I saw of the rig it was suffering from dry/wet rot and lack of use.

As to the miles when I sold it, I should point out, I rented it through an agency.