gf261

I remember reading on one of the posts here that the 93 GTS used more oil than the later models due to a piston difference. Any insight? My best friend is in the GTS market and is looking to purchase VERY soon. Thanks for any responses, and/or other differences that you might be aware of.

cobalt

I don't know if that is true but the technical douments show oil consumption at 1 quart/1000km for all GTS's In fact they use that number for most all Porsches.

Good Luck on the purchase.

cobalt

I should also add that the '94 technik book makes no mention of any changes to the engine only the auto trans for 94 on.

928ntslow

I am beginning to think that a lot of the oil consumption has to do with how heavy the right foot is and at what point the foot is heavy. I have had my car since August and in that time, the oil consumption has has no consistency. I thought to expect 1 US quart per tankful, but it has never been that. More like 1 quart per 1.5 to 2 tanks

However, I did a run to Phoenix from Los Angeles a couple months back and barely used 2 quarts throughout 4 or more tankfuls. Never saw 55 mph, was way above that. I do think that I use more oil when I am punching the car around town with shorter distances. If I casually cruise around town, the consumption seems to be less. This is all I can equate the usage to at this point.

I have no idea what the 94's and 95's are doing. I don't think they did anything to the lower part of the GTS engines throughout their run.

Bill Coleman

I've heard of higher oil consumption in the GTS, but NOT that there was a difference in any model year.

heinrich

Keith that is significant!

Bill Coleman

Wasn't the theory that the GTS had forged pistons which were a little undersized until they warmed up?

CMW

I have to agree with Keith.... at 1st I thought my car didn't experience the problem to much..then it seemed low... then it was really hard to tell with all the S/C testing.
On my car it seemed to be a quart low after about 1000 which is much better than some cars I have heard of.

heinrich

Are you guys sure this isn't just (I know it has been discussed over and over) a breather / sloshing issue exacerbated by the long throw of the GTS crank and new-style breathers? In other words, have you checked your intakes for oil?

drnick

so far to me it seems that all 928 engines use oil due to a variety of reasons and the GTS has several more: longer crank throw; no oil return holes in the pistons. furthermore, i suspect it is the forged nature of the pistons that was responsible for some engines developing more substantial oil use as they wore the bores oval. i think the change in piston design occured from 93 onwards.

heinrich

Sounds plausible, yet we've seen some of the worst oil consumption in specifically '92 models.

drnick

too bad the engine im re-powering with is a 1992! i think i will be extra careful and allow the engine a nice long warm-up time...

heinrich

Nick you're lucky to even have one

bigs

I have an interesting '93 GTS. It's build date is January 1992, but sold as a '93 model and is a true GTS in every way.

It has about 73+K on the clock. I have no oil leaks at all.

I often drive it in a, shall we say, "spirited" manner? But it's usually about a 20 minute burst at a time up Provo Canyon and back - about a 30 mile round trip. Because of the twisty road, I don't usually get much above 100 mph. I do that fairly often, maybe 3-4 times a week. Don't use it as a daily driver. With that type of usage, I find that I'm adding a quart of oil about every 2,000 - 2,500 miles. I dont' think that's too bad. At my driving frequency, that equates to a quart of oil about every 8 months.

On the other hand, a few weeks ago I took it on a 130 mile round trip and hit sustained speeds of 140 for a fair bit of the trip. On that one trip, I started out with the oil in the middle of the dipstick and got the "low oil" warning light when I reached my destination 65 miles away. Had to add a quart before I started back home.

So I would agree with Keith that oil consumption, at least in my experience, is a function of the right foot in large measure. And seems to be worse at sustained high speeds.

I would also be interested to know if oil consumption has any relationship at all to the weight of oil used. I have Mobil 1 10-30 weight. I'd like to use a 5-40 weight, but my kids gave me a case of the 10-30 for Christmas so I put it in.

Blown Beast

Take apart a GTS engine and it is very obvious what is going on.....the pistons were made with the drain back holes not drilled/forged all the way through. This causes the oil to build up in the sides of the pistons around the wrist pins. The shorter skirts also don't help the situation any.