Mohammed_z

Engine Oil

It's recommended to use Mobile1 5w30 to out LT1s as said ,

When I went today to search for oil , I couldn't find the 5w30, I found this : 0w40




as I remember it's fine to use 10w40 , is it ok to use mobile1 0w40 ??


I found another brand with the same number , which is castrol but I don't know if that's a good replacement for the Mobile1 !!





Transmission Oil : ZF6

I never changed the zf6 oil , but as I read through the forum , most say it's GM 1052931 or Castrol 10w60 .

When I asked a guy he said that the oil in the below pic is fine to use in the zf6. Is that true ?



I'm not sure if I can find the same GM oil here , so i'm searching for another replacements so I don't use the wrong oil specs in my zf6.


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FYI : 1 L of Mobile1 costs $12. let me know if it's cheap or expensive comparing to the U.S

H P Bushrod

I don't think either of the sythetic oils will hurt anything (the Mobil isn't the recommended weight), but I'd check the bottle to see if it meets GM standard 4198 (for our engines). If it does, use it. DON'T put the gear oil in the ZF 6spd tranny. The factory fill for it is a 5w-30 oil with an additive for use in the manual transmission. Hopefully you can find the right oil for the transmission over there.

aboatguy

I believe there's a BMW oil that some of the ZF transmission users swear by. It may be easier to find than GM oil in Saudi Arabia. As for the Engine oil I'd use the Castrol Before the 0-40 but I'm not a fan of using oil that is thicker than required.


Link to ZF tech tip

http://web.archive.org/web/200405051...D=49&TopicID=2

Link to a ZF oil thread..
http://forums.corvetteforum.com/c4-t...ff-better.html

Mike

WVZR-1

The 80W90 is certainly a "NO" for your ZF.

Mobil1 is different for every marketing area in the world. APSCO seems to be the sole marketeer for your area and there doesn't seem to be a 5W30 product in Mobil1 distributed by them. It may have to do with the higher ambient temperatures in your area and the 0W40 looks to have higher sheer #'s. In your other hand you've got the 5W30 Castrol. Your choice I'd guess. Contact APSCO!

Dependent upon what's available and how much effort you want to go through for the ZF the original 1052931 was 5W30 viscosity product with an additive package. There are those that use Synthetic 10W30, some 5W30 even and then there's the 10W60 TWS. Check a BMW dealer and see if the Castrol TWS 10W60 product is available there. I believe it is but it's not considered TWS. I believe it's Edge!

RollaMo-LT4

Do NOT use that oil in your ZF6 transmission.
That is a gear oil for older manual transmissions and differentials.

1 quart of Mobil 1 5w-30 is listed for $8.99 here

I believe either of the two engine oils would be fine.
I would learn toward the Castrol though, since it is the recommended weight.

Mohammed_z

I need to see what are the GM 4198 standard.

Is 5w-30 for the transmission means I can use any oil with the same weight ? even if it's an engine oil ?? or it has to be written on it that this is a gear oil ?




Thanks for the links




So I have to search for the oil and additive also !! , I will check with BMW dealers




I'm afraid it was used in my car !! Good thing I drive the car only during weekends and the shifting is smooth so far, but that's why I opened this thread , it's summer now and time for maintenance. Weather doesn't help for cruising or enjoying the Vette. lol


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ok , so the 10w30 and 0w40 are suitable more than 5w30 since I live in a hot area.

10W-30 Pros and Cons

• The pros of 10W-30: It is a better choice for vehicles that operate in hot climates; it is a better choice for stop-and-go driving; and it is a better choice for vehicles that frequently haul heavy loads. However, it is not as good as 5W-30 when used in extremely cold climates.
  
  

I'll search in the market for this weight.Hopefully it's available , 0w40 is fine but it's thicker.









Does anyone have pics of different types of oil that used in the ZF6 ???

RollaMo-LT4

This is what a lot of us are using.
There is a member here on the forum that is a dealer.
C66 Racing
http://www.c66racing-synthetics.com/



You probably won't find this in any store though. You need to order it.

Mohammed_z

How do you know if this oil is the right type without seeing the weight specs ?

RollaMo-LT4

It is a 5w-30 spec.
It also meets the GM specs.

Link to the spec sheet
http://www.amsoil.com/shop/by-produc...n-fluid-5w-30/


I am not trying to convince anyone to use this or any other fluid.
There are other choices if you do some searching.

I just mentioned that quite a few ZF6 users were using the Amsoil.
I've been using it for over 50k miles without any issues.

I along with others also made sure you were aware that the Gear Oil you posted up was not to be used in the ZF6 transmission.

C66 Racing

AMSOIL Synthetic Synchromesh Transmission Fluid (MTF) (Product Code MTFQT)

Thanks for the mention and for those in the U.S. or Canada I can get the above linked MTF which is the correct fluid designed specifically for ZF6 type transmissions.

Unfortunately, can't help the OP who is in Saudi Arabia - sorry.

For the OP, I would use either oil. Though the Mobil 1 is a 40 grade and slightly higher viscosity than GM recommended for the U.S. spec C4, that is the oil they currently recommend for the C6 Z06 in Europe. The slightly higher viscosity will help offset viscosity loss due to the high temps I suspect you see in Saudi Arabia. With the higher viscosity, I'd be gentle on the engine while the oil warms up. The Castrol 5w30 would work but it would be my 2nd choice of the two you've posted.

I concur with the others - do not use a gear oil in your transmission.

Mohammed_z

Good tip , thanks for the info .

Is this has something to do with my engine warm up taking little more time ? Big aftermarket Aluminum radiator with this mobile1 0w40 !!?

Aaron Keating

I just put 5w 30 Mobile 1 synthetic high mileage in my L98.
I wasn't really leaking oil before, but I figure she's got 140,000 on her now. I probably dodged a bullet last year when I put the normal mobile 5w 30 synthetic in.

C66 Racing

The oil viscosity won't have a major impact on how fast the oil warms up, but if you do have a big aftermarket radiator, that might.

The coolant system has a valve commonly referred to as a tsat. Not sure of the exact set point on the C4, but a stock C5 tsat is set at about 194F. When the coolant is below this point, the tsat is closed and coolant recirculates in the engine to warm-up faster. When 194F is reached, the tsat opens and coolant then flows through the radiator. If there is little load on the engine and you have a big radiator, the coolant might stay right at this temperature. As the oil temp is largely impacted by the coolant temp, this might keep your oil from fully warming up.

My personal rules of thumb are to use easy throttle and low rpm (say below 3000 rpm) until the oil is at least 150F (not note the coolant which will warm up faster than the oil), then I'll start to gradually get on it.

I'll admit that I do not know if you can see oil temp on the C4, but you can on the C5 Digital Information Center (DIC) and I always have the DIC set to oil temp.

aboatguy

http://www.zfdoc.com/techinfo.htm




Also recommends a 10w 60 BMW oil BMW P/N
07510009420

I believe you will be able to find the bmw oil in Saudi Arabia.

MIke

Aaron Keating

I dunno for sure about Mohommeds later model C4, but you can see the oil temp on my 80s Atari dash. I set mine to oil temp till it' hits 150 degrees F too. Then I switch it back to oil pressure just to keep an eye on it.

C66 Racing

I'm spoiled as I have an oil pressure bar on my HUD, and while it doesn't give me exact oil pressure it gives me close enough to know it is good (or not good) so I can keep my oil temp called up on the DIC. And thanks for letting me know at least some C4's can see oil temp on the dash.

RollaMo-LT4

Yes, oil temp can be displayed along with oil pressure.

The late model C4's have both a digital and analog oil temp. gauge.
Oil pressure is an analog gauge only.

Pingman326

Amsoil all the way !!
I use it in everything I own with an engine !

Mohammed_z

ok finally found castrol tws at BMW dealer ,


I found this in local shop too , does this work with the zf6 ? just asking for knowledge, I'm going with castrol

WVZR-1

Many I guess use the RP you supplied the image of BUT from there own (RP) lubrication guide the replacement for the original GM # 1052931 is NOT that product. Their recommended product is their HPS 10W30:



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