J Chen

Hosrom,
O-40 in Dubai ? That's to thin. Try to get something else.
Aren't there any other brands available ?
BTW guys recently I've been using Belray 5W60 oil, it's
very good indeed. Film strenght & stability is very good.
Oil pressure does not drop below 3 event in heavy traffic
on a hot day. Engine revs smoother & faster alot like Redline.

hosrom_951

We had Mobil 1 15w~50 (wherever you go, you'r sure to fine one)

Now, rumors say that Mobil want's to remove ALL traces of the 15w~50 in the market and replace it with the 0W~40 (which i am using now).

The engine saw Mobile 1 fully synthetic since the day it left the factory (got bills going back to '86 to prove it ) but the grade was not written (?) for some reason.

I used to get 3~3.5bar on idle from the oil pressure gauge, drive it hard and it drops to 2.0bar (even in this hot weather with a/c on) using the 15W~50.

Now, i see 2bar (1.9 with a/c) while 'normal' driving and falls to 1.5bar (sometimes 1bar with a/c) with the 0W~40.

Now that is a big difference. The car LOVED the 15~w50, now i always leave the car idle for a few extra minutes (even w/o using the turbo) to let the oil pressure go up a bit i miss the 15w~50, and i would recommend it since it made wonders, even in this harsh heat.

hosrom_951

BTW, here is some history/news on Mobil oils.

Mobil oils were used on EVERY space shuttle mission go to their website, if it's good enough for NASA, it's good enough for me

J Chen

Hosrom,
You haven't tried enough oil. There are so many brands
which are better out there. As long as it is synthetic, I don't
see that it's possible to demage the engine running different
brands. As for me, I like trying diffrent brands whenever I
make an oil change.

SamGrant951

yes, yes I did...work is getting to me I guess

Asarus

My opinion :

For the break in : conventional oil for the first 300 miles, change the oil after for the next 1000 miles, still with conventional oil (be careful not to use the boost and keep the rev under 3000 rpm)

Then (after 1500 miles) : use good synthetic oil and increase the rpm progressively
Castrol Formula RS 10w60 or Motul 15w60 for example

slim_boy_fat

Yes it is but Scotland is not renownd to be a warm as where you are....

Hence better having the lower winter rating...

15 is just a tad high when the average winter temps can be well below zero

slim_boy_fat

Sorry but 0w-40 is NOT too thin for our engines.

Just cause oil pressure reduces doesnt mean the oil is not flowing. Less viscious liquids require less pressure to flow at the same rates...

15W is too high too use in Scotland. I would be more thna happy with a 5w rateing but I like using Mobil oils, if they produces a 5W-50 then i would use that instead.

The most important thing is to use a good quality fully synthetic oil (after running in)

Engines do not fail because they used Mobil 1 0W-40

schnellfahrer

I run M1 5w-50. The P-shop I use put it in without asking.

theedge

Mobil 1 15W-50 FINALLY showed up in my area at the place I usually shop at. I was VERY pissed cause I bought prolly 20 liters of Castrol 20W-50 to have a nice stockpile... Then the next week I see Mobil 1 arrives in the weight I wanted

hosrom_951

J Chen: You'd better watch is when using different oil brands

Some think gardes matter, some think brands matter, some take both as a precaution.

Though the factory manual recommends certain grades and not brands, brand make differences.

I used synthetic oils and non synthetic oils in my 88 NA, the engine blew up.

When they removed the engine and dismantled it, they asked me which was the last oil brand/grade i used.

Told them the last one was Mobile 1 15w~50 (that time when it was available).

My specialist noticed some oil sludges that were 'sticky' and literally stuck on the oil pump causing poor rotation (some crap like that, i wasn't paying much attention to what he was saying at the time).

He confirmed to me that by using so many differnet types of brands AND grades alike, he said that i should stick to a certain brand/grade.

My BMW 328Is is running on Mobile 1 0W~40 right now, now hitting 200K+kms on the STOCK engine and no oil consumption what-so-ever

The mechanics at the dealership were suprised to see that after this high milage i got stock compression ratios and leak downs during both tests.

Fiddling through the records, they found that the car (since new) was running on Mobil 1 since then till now.

What i am trying to say is that in my own personal experience with brands/grades, sticking to one would work out best for you and the engine.

HansB

Well some of us do mind this red oil light coming on with a oil pressure down to 2 bar. Also the consumption goes up to a litre an hour on the track.

We use a special (for europe) imported 20w50 Mobil synthetic oil, no oil pressure problems, less oil consumption. Works for me.

slim_boy_fat

That fine but using Mobil 1 0w-40 does not drop the oil presure below 2.5 when its ticking over at idle after a hard run, for high revs when hot it sites at 4 and 5 on a cold start.

So i would suggest there is something else wrong with your car.

As for consumption yes you migh use a tad more but so what, just means that you always have nice new clean oil in your engine.

20W is just NOT suitable for Scotland....I am not saying we need 0W oil but it just so happens thats what i use.

I wouls bet any money agains my engine being in tip top condition if it was stripped down right now after 90k miles.

The reason i use the oil i do is because its good for the engine not becasue its good for my wallet.

hosrom_951

On the track your oil consumption does tend to get higher.

Last night, was the first time i abused the car (not track) but always redlining, always using the turbo hitting 200+km/hr

AFter 1+hours of driving, i lost 0.5L of oil.

When i drive the car normally and do not use the turbocharger, oil consumption is 1l/6,000kms (far more than what the factory claims).

I used to drive it (w/o turbo) during the days, and weekends revv it up, got 1L/3,000kms...

Oil pressure should NOT drop below 4bar at 5,000rpm, if it does you have a problem somewhere.

After the hard driving last night, i got 1.9~2.0bar at idle (0w~40 oil here), after cruising and letting it cool down, i got 2.2~2.5bar on idle (that is 'cool' temp using this thin grade here at these hot climat temps).

Jaak Lepson

As a former Amsoil Dealer (too busy to keep up due to day job), I did learned a bit about oil. How many people here do an oil flush at least once a year?

Do one and look at the crud that comes out. One needs to flush the oil at least once a year to keep the motor in good shape. We flush our rads and brakes but not the oil system. This is one of the keys to prolong the engine life ... consider it as plaque in your bloodstream.

Motors should be broken in with conventional oil for about 1500 KMs (1000 miles), then switch to a good synthetic oil. Synthetic oil does not break down as much as conventional oils, reduces the friction (less heat and wear), has a higher flash point, flows at lower temperatures below freezing and suspends the dirt particles better. Use a good oil filter and in some cases replace the oil filter twice between oil changes.

Friends that I had who changed to synthetic oils saw their engines idle smoother, motors run cooler and their gas milege improve in some cases by over 10%. They still use synthetic oils in all their cars.

Jaak Lepson