Page 4 of 4
S54 specialist needed!!!!!! Possible cooked Motor
Posted: Sat Jun 03, 2017 1:37 pm
by Vanne
mmm-five wrote: ↑Sat Jun 03, 2017 10:59 am
dannytheduck1985 wrote: ↑Fri Jun 02, 2017 10:15 pm
What's people's thought on changing from 10w60 to 0w40 oil? More viscous at low temperatures, a lower heat rating but more vicious at high temperature. Let's face it if your oil temp is exceeding 125 degree, the oil breakdown is the least of your worries.
This is recommended by Mr Vanos
This is an argument that came up many times on the M5 Board when I had my e34 M5s, and I was hoping it wouldn't come up here
Just so we all understand the coding of multigrade oil, the 10w or 0w is the cold crank viscosity and the 2nd number is the minimum viscosity that it has to be at 100ºc.
At 0ºc 10w60 has a cold crank viscosity of 874cst vs 665cst of 0w40.
At 100ºc 10w60 has a hot viscosity of 24cst vs the 14cst of 0w40 (i.e 10w60 us about 70% more viscous).
So, a thinner oil will circulate faster when cold, but a thicker oil will (to a limit) work/protect better at higher temps.
However, the optimal oil for any specific use will depend on that use. If it's a daily driver that hardly gets to warm up, is never hooned or tracked, nor sits on an autobahn at over 100mph for an hour at a time, then a lower viscosity oil will be fine.
There are stories on the internet regarding a decision BMW supposedly made, early on in the life of the S54 when they changed the recommended oil from an 0w40 to the 10w60 we use now. Some say it was due to a deal/collaboration with Castrol to sell the TWS (but I was using that in the S38 M5 before the S54 came out anyway), and other say it was due to oil pressure & oil use issues.
You might find you use more oil as it blows past the rings/valves and burns, but it won't be much (e.g. on the e34 M5 it was not uncommon to use a litre of oil a week/500 miles).
Different oils will have different lifespans - not related to the viscosity rating. They will all pass their tests when new, but many will break down very quickly and should be changed more regularly...some 'extended life' oils will break down slowly over 15,000 miles whilst others will reach the same lower levels after only 5,000 miles.
Ultimately is down to personal preference. I choose to use 10w60 and change my oil & filter every 6-7,000 miles and also after a Ring trip.
A liter of oil for 500 miles would be extremely alarming... Extremely!!!
S54 specialist needed!!!!!! Possible cooked Motor
Posted: Sat Jun 03, 2017 2:37 pm
by mmm-five
Vanne wrote: ↑Sat Jun 03, 2017 1:37 pm
A liter of oil for 500 miles would be extremely alarming... Extremely!!!
That was the lower end of 'normal' as far as the dealers were concerned. More common was 2000 miles per litre, it the very rare one did less than 1 liter between scheduled services (6,000 miles).
Don't forget that this was on a completely different engine...the e34 M5 s38b38.
My S54 has never used any oil between services.
S54 specialist needed!!!!!! Possible cooked Motor
Posted: Sat Jun 03, 2017 3:15 pm
by Vanne
wow man, my S54 pretty much burns no oil.. well not enough that i can tell on the dipstick between services.. and its hot here...
but then again, my car gets new oil every 2500km
S54 specialist needed!!!!!! Possible cooked Motor
Posted: Sat Jun 03, 2017 3:18 pm
by tjlazer
I do less than 5000 miles a year with annual changes. Never had to top up, if that's any guide of anything.
S54 specialist needed!!!!!! Possible cooked Motor
Posted: Thu Aug 10, 2017 11:12 pm
by dannytheduck1985
Smartbear wrote: ↑Fri Jun 02, 2017 10:59 pm
Hi, I remember your car had a broken sump when you got it-I wonder how long it ran with oil leaking out the engine.....
Rob
I don't think the car run for long with a tree wedged between the turret and the engine
S54 specialist needed!!!!!! Possible cooked Motor
Posted: Thu Aug 10, 2017 11:17 pm
by dannytheduck1985
Just noticed the comments about burning oil.
I can recall topping mine up once in the time she was on road. Oil had dropped a quarter of the dip stick (obviously a quarter of the distance between min and max). I was expecting that because every car I drive gets a hard time.
S54 specialist needed!!!!!! Possible cooked Motor
Posted: Sat Oct 14, 2017 4:34 pm
by dannytheduck1985
Problem is big end bearing.
Cars in BM Conversions UK Ltd having a rebuild and a lot of part upgrades. Owner has become a friend through the E28 scene so he wants to strip the car and do it all again to a higher quality. That’s engine and car
S54 specialist needed!!!!!! Possible cooked Motor
Posted: Sat Oct 14, 2017 4:40 pm
by Z4M-2006
Christ Dan..
The money you spunked on that car is alarming....
You could have bought something proper!......
S54 specialist needed!!!!!! Possible cooked Motor
Posted: Sat Oct 14, 2017 4:52 pm
by dannytheduck1985
Z4M-2006 wrote: ↑Sat Oct 14, 2017 4:40 pm
Christ Dan..
The money you spunked on that car is alarming....
You could have bought something proper!......
Suprisingly not going to cost that much. He needs a spark to wire his new premises. I’m an industrial spark.
Cars going race I think now. He has rebuilt his S54 so it’s bullet proof, I’ll have some of that
I can’t bring myself to chop the car. It was from a time when my dream didn’t fit my budget. Cars a headache but I’ll never be parted from it.
S54 specialist needed!!!!!! Possible cooked Motor
Posted: Sat Oct 14, 2017 5:49 pm
by Z4M-2006
Whats it stand you at now ?
S54 specialist needed!!!!!! Possible cooked Motor
Posted: Sat Oct 14, 2017 6:23 pm
by dannytheduck1985
Z4M-2006 wrote: ↑Sat Oct 14, 2017 5:49 pm
Whats it stand you at now ?
Stupid money.
only got 2.5k out of it before blowing it up
It’s staying at the workshop unit totally rebuilt again. Want it dan proof.
Now I’ve got the B9 resto and that going on
Good job I’ve got a trade, shelling the B9 was free, glass blasting...... free, raptor under-sealing...... free, rebuild....... free apart from parts.