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» Dennis Tomlin (White C4) by rubyragtop on Tue 16 Jan 18 20:22

New Vet. Engine oil


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v8nut

Club Member

Wed 03 Jan 18 13:08

New Vet. Engine oil


Hi All

I am the new proud owner of a red 1991 C4 coupe auto. Pic attached I hope.

This seems to be a very well looked after car, and a tribute to its previous owners.

Getting it was a long story, but in the short term I need to get the engine serviced.

What are the recommended choices for engine oil?

I am sure this will have been covered many times on this forum, but for some reason I don't seem to be able to search the topics.

Am I missing something obvious?

Thanks

Emrhys Barrell


--------------------
Unreconstituted V8-head. 1973 Stag. 1981 S&S TR8. 1969 Avenger 21 Powerboat originally owned by Tommy Sopwith, now with a 5.7 Mercruiser. Looking for a C4 to complete the family.

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kentvette

Club Member

Wed 03 Jan 18 15:40

Re: New Vet. Engine oil


I think that the Corvette was "Factory Filled" with Mobil 1 Synthetic by 1991? That being the case, that's what I'd put in it at oil change time.

Nice looking car, by the way!



Last edited by kentvette on Wed 03 Jan 18 15:42; edited 1 time in total. [11 %]
--------------------
Stephen J Irons
CCCUK Lifetime Member
Corvette Club France
Corvettes of Southern California
NCM Family Member
Stephen & June's Web Site
Red Corvettes Have More Fun!

Apple IS Genisys!
The "Born-Again Greenies" are killing the planet! It's time to wake up and smell the rain-forest burning!

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FelixP

Regular

Thu 04 Jan 18 10:17

Re: New Vet. Engine oil


That's a nice looking car, cool air intake!

I've been using Mobil 1 5w30 in mine, it's readily available in Halfords.


--------------------
1989 Corvette C4 L98 6 speed ZF with Z51 & FX3

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Rich

Club Member

Thu 04 Jan 18 11:53

Re: New Vet. Engine oil


The Mobil 1 5w30 sold in Halfords has never been quite the same spec as that sold in the US which is why Keith Beschi of Eurovettes imports the US spec oil. Please don't ask me what the difference is!!

However, a few years ago GM stopped recommending Mobil 1 and instead recommend oils meeting Dexos 2 spec in Europe (or Dexos 1 in the US).

There was a very useful thread on the subject of Dexos 2 here, but unfortunately it seems to have been deleted as part of the website housekeeping.

Dexos 2 is available at all Vauxhall dealerships. I have been using it in my two previous C6s and now in my Camaro which is under warranty.

I don't think the UK Mobil 1 is going to cause a problem, but thought I should post just to clarify.


--------------------
Rich Rogers
CCCUK Lifetime Member
2017 Yellow LT1 Camaro

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5 USA

Club Member

Thu 04 Jan 18 14:00

Re: New Vet. Engine oil


Dexos 2 also available from Amazon UK at £25 for 5 litres,
https://www.amazon.co.uk/Opel-5W30-dexos2-Engine-Oil/dp/B008...

I've always used Mobil 1 in either 0w-40 or 5w-30 and the Vettes have never complained!


--------------------
The Stingray has landed!

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eurovettes

CCCUK Supporting Vendor

Fri 05 Jan 18 16:50


Dexos 2 is the GM equiv of Mob 1 5w30 - it may even be Mobil1 with a gm badge
I would not usually suggest 0w30 in vettes as the GM recommendation is 5w30 - you need a bit of viscosity when cold to help lube all the upper areas on cold crank

Wow great amazon price no wonder not many want my us spec 5w30 mobil1 lately

just my thoughts
Smile
Keith

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roppa440

Club Member

Sat 06 Jan 18 13:25

Re: New Vet. Engine oil


If anything go heavier on the first figure i.e. 10w.

0w and 5w are for countries where winter temps can get a hell of a lot lower than they ever do in the UK.

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5 USA

Club Member

Sat 06 Jan 18 15:13

Re: New Vet. Engine oil


roppa440 wrote (View Post):If anything go heavier on the first figure i.e. 10w.

0w and 5w are for countries where winter temps can get a hell of a lot lower than they ever do in the UK.


Your point about UK temperatures is valid. The result is that the first figure doesn't matter much at all - any of the modern oils will be thin enough for cold start lubrication.

Either a 30 or a 40 is fine, the "30" being specified mainly for economy/emissions.

In C7 Stingray GM recommends a thicker Mobil 1 15w-50 for "track events or competitive driving".

The overall GM recommended "you can't go wrong with this one" oil for C7 appears to be "Mobil 1 to Dexos specification".


--------------------
The Stingray has landed!

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eurovettes

CCCUK Supporting Vendor

Sat 06 Jan 18 18:39


some c5's suffer with piston slap on startup and occasionally switching to 10/30 can lessen the noise,

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Havvy

Club Member

Sun 07 Jan 18 14:12


Shell Ultra Helix Professional AG 5W-30 meets Dexos 2 standards and is readily available from Eurocarparts, currently at £24.99 for 5 litres.

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