Mobil 1 in a 4AGZE

[fivebob]

yea alot of the the cars that get serviced at toyota are castrol 10 30
magnatec that does new models and old as far as performace goes thats up to u but i do think 5w50 is a bit thin

But 5w-50 is thicker than 10-30 where it counts, i.e. when the oil is hot

[sergei]

Why people think that the thinner the oil the bettter it is for engine?
it is defently not, it is better for performance/efficiency but not really for protection, well actually protection is not totaly dependand on viscosity anyway - there are factors like film strength, flash point, detergancy etc..
The advantage of synthetic oil is not that they are thinner (castrol R 10w60 is good example of really thick oil when hot), but because they are designed to have certain propeties, and have much less impurites / neutral substanses as mineral do.

[touge rolla]

i've found that shell oils burn badly from 10w40, 15w4o and 20w valvoline armour all 15w40 is not bad at all, and cheap

[Allister S]

Hey, I found this post in a search and thought it was fairly interesting.

I agree with the comments on the 5W oils being a bit thin but on the topic of Mobil 1 there is a bit of history.

I first put my early spec AE92 GZE engine in my car in 1994 and started using Mobil 1. But at the time the common Mobil 1 was a 15W-50 grade. I've done 100,000 hard kms since and have never burnt a drop of oil and the engine looks brand new inside.
I still use the 15W-50 Mobil1 but I have to get it ordered in whenever I need it (Even Repco can order it in) as I never see it on the shelf anywhere. For a time Mobil even only had it as a motorbike oil - Racing 4T but they told me it was the same 15W-50 oil I'd been using.

So from form my experience Mobil1 seems like a good oil but only the thicker 15W-50 grade.

[Mr. Mainstream]

Ive heard lots of bad things about magnatec and turbod cars.

it killed one of my B6-T engine

[BlakJak]

Ive heard lots of bad things about magnatec and turbod cars.

it killed one of my B6-T engine

And it ran beautifully in my 3SGTE.

[Mr Revhead]

Ive heard lots of bad things about magnatec and turbod cars.

it killed one of my B6-T engine

how?

[Bling]

halfway through a 5 minute skid au.

[Mr. Mainstream]

halfway through a 5 minute skid au.

Lies

No Idea. in my 2nd 323 from which i scoured the engine from my first 4wd one after doing the convertion and getting it running mint i did a oil change with magnatec and 2 days later it started blowing horrible smoke and all sort so gave up on that engine.
could just have been a freek thing but saying that ive heard bad things about magnaTEC and B6-T's on www.fordlaser.com

Valvoline engine armour has been good in several off my cars'

[Allister S]

I've used Magnatec in 2 GTS-t skylines and a GT Legacy without any trouble - all Turbos and high km cars. Used the standard GTX every 3rd oil change - some guy said to (can't remember who or why....)

But then I've never had an engine blow up on me so maybe any oil would've been ok??????

[fivebob]

I've had one 3S-GTE blow up using Magnatec and one blow up using Mobil-1. Not sure the oil had anything to with either experience

[Mr Revhead]

I've had one 3S-GTE blow up using Magnatec and one blow up using Mobil-1. Not sure the oil had anything to with either experience

i can only see 2 common factors there!

[matt dunn]

We found that synthetic oils dont absorb heat from the engine as much as non-synthetic.

Good for a NA car,

But on a turbo car, they dont remove the heat from the shaft enough for some applications.

[fivebob]

We found that synthetic oils dont absorb heat from the engine as much as non-synthetic.

Which synthetics? Not all of them behave the same.

[matt dunn]

Particulary Older Castrol R, which we had turbo trouble with,

and also the New Castrol Edge which is the same stuff.
Have had a few new turbo's fail at times and have had the turbo repairer say it was excessive heat in the shaft from synthetic oil.


We did an oil change at the track, from edge to Castrol Protec,
Engine temps dropped 20 deg and oil temps gained 20 deg.

Still use castrol now, just the turbo-tested stuff.

[fivebob]

Hmmm, I wonder what is in the Castrol package that causes that. Generally speaking synthetic oils have a better specific heat capacity than mineral oils, meaning they should be better at extracting and transfering heat.

Mobil-1 does not exhibit the same characteristics. From watching my oil temp vs coolant temp, the oil heats up at the same rate from cold and generally runs about 5-10°C hotter than coolant. It also responds to engine load quicker than the coolant. Typically the oil will rise 5°C before the coolant temp starts to rise.