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Oil recommendation for a 1986 L98 Corvette, please #1893612
05/17/10 12:15 PM
05/17/10 12:15 PM
Joined: Mar 2010
Posts: 639
Finland
Finn Offline OP
Finn  Offline OP

Joined: Mar 2010
Posts: 639
Finland
Hello. cheers

Here's some background:

1. What kind of vehicle you have
Chevrolet Corvette 1986 L98 ie. 350 TPI, 65 tml

2. What your owner's manual says
Sorry, no manual, just 5W-30 info on oil cap

3. Where you live
Northern Europe, will run it only in the summer in temp range of 40...90F

4. How you drive (easy? hard? fast? slow?)
Easy driving around town and highway, some blasts trough the twisties and a relative easy track day or two in the season.

5. What your daily drive is like (short trips? long trips? city? highway?)
Mostly short trips in the city/highway. Also longer highway trips on vacation when touring.

6. Whether your car has any known problems
No engine problems. Previous owner has used Kendall GT1 5W-30.

--------------------------------------------------------------

Right. I could use some advise on what oil to use. I'm switching away from previous owner's Kendall because it is not available easy and it costs more than Mobil 1 0W-40.

Over here there are couple of 5W-30 oils available on the shelf but they tend to be Long life types. These are such as Mobil ESP, Castrol Edge, Valvoline Synpower, Shell Helix and some local brands such as Teboil Diamond and Neste. Also GM 5W-30 Longlife is available easily.

If you recommend me to stay with 5W-30 is there a brand you would recommend for me? 5W-30 oils such as Redline and Royal Purple are not available here.

It seems that the most common weight over here nowadays is 5W-40 and just about any of the bigger names have their products available in this weight such as Shell Helix in several types, Mobil Super 3000, Castrol Magnatec etc. Also some brands in 0W-40 weight, too.

Given the background above and info on what is available (just few listed) I'd like to ask whether:

- I should stick with the 5W-30 -> which one?
- switch to 5W-40 -> which one?
- what about 10W-40? Redline and Brad Penn available

I fear I'm overthinking this matter ie. does the brand/type/weight matter at all for this old engine?

Thank you for your patience. blush


2000 Jaguar XJR | 1978 Corvette 383" | 1986 Corvette 350" | 2011 K1600GT | 1991 300 SE | 2000 BMW X5 3.0i
Re: Oil recommendation for a 1986 L98 Corvette, please [Re: Finn] #1893625
05/17/10 12:21 PM
05/17/10 12:21 PM
Joined: Mar 2008
Posts: 6,168
South Florida
bubbatime Offline
bubbatime  Offline

Joined: Mar 2008
Posts: 6,168
South Florida
Shell Helix 5w30 would be my pick.


17 Chrysler Pacifica Edge Syn 5W30
13 Yamaha XT250 Valv MC 10W40
10 Acura TSX 2.4 SuperTech Syn 5W20
06 GMC Sierra SuperTech 10W30


Re: Oil recommendation for a 1986 L98 Corvette, please [Re: bubbatime] #1893634
05/17/10 12:26 PM
05/17/10 12:26 PM
Joined: Jun 2009
Posts: 1,509
gulf coast FL.U.S.
FL_Rob Offline
FL_Rob  Offline

Joined: Jun 2009
Posts: 1,509
gulf coast FL.U.S.
Originally Posted By: bubbatime
Shell Helix 5w30 would be my pick.

+1 (short trips)

Last edited by FL_Rob; 05/17/10 12:28 PM.
Re: Oil recommendation for a 1986 L98 Corvette, please [Re: Finn] #1893638
05/17/10 12:29 PM
05/17/10 12:29 PM
Joined: Jun 2009
Posts: 1,509
gulf coast FL.U.S.
FL_Rob Offline
FL_Rob  Offline

Joined: Jun 2009
Posts: 1,509
gulf coast FL.U.S.
Originally Posted By: Finn
Hello. cheers

Here's some background:

1. What kind of vehicle you have
Chevrolet Corvette 1986 L98 ie. 350 TPI, 65 tml

2. What your owner's manual says
Sorry, no manual, just 5W-30 info on oil cap

3. Where you live
Northern Europe, will run it only in the summer in temp range of 40...90F

4. How you drive (easy? hard? fast? slow?)
Easy driving around town and highway, some blasts trough the twisties and a relative easy track day or two in the season.

5. What your daily drive is like (short trips? long trips? city? highway?)
Mostly short trips in the city/highway. Also longer highway trips on vacation when touring.

6. Whether your car has any known problems
No engine problems. Previous owner has used Kendall GT1 5W-30.

--------------------------------------------------------------

Right. I could use some advise on what oil to use. I'm switching away from previous owner's Kendall because it is not available easy and it costs more than Mobil 1 0W-40.

Over here there are couple of 5W-30 oils available on the shelf but they tend to be Long life types. These are such as Mobil ESP, Castrol Edge, Valvoline Synpower, Shell Helix and some local brands such as Teboil Diamond and Neste. Also GM 5W-30 Longlife is available easily.

If you recommend me to stay with 5W-30 is there a brand you would recommend for me? 5W-30 oils such as Redline and Royal Purple are not available here.

It seems that the most common weight over here nowadays is 5W-40 and just about any of the bigger names have their products available in this weight such as Shell Helix in several types, Mobil Super 3000, Castrol Magnatec etc. Also some brands in 0W-40 weight, too.

Given the background above and info on what is available (just few listed) I'd like to ask whether:

- I should stick with the 5W-30 -> which one?
- switch to 5W-40 -> which one?
- what about 10W-40? Redline and Brad Penn available

I fear I'm overthinking this matter ie. does the brand/type/weight matter at all for this old engine?

Thank you for your patience. blush

You're at home here ,most of us agonize over this stuff.

Re: Oil recommendation for a 1986 L98 Corvette, please [Re: FL_Rob] #1893641
05/17/10 12:30 PM
05/17/10 12:30 PM
Joined: Sep 2005
Posts: 14,684
Canada
addyguy Offline
addyguy  Offline

Joined: Sep 2005
Posts: 14,684
Canada
Any of the 5W-30 you mentioned would work well.

I'd go with the Edge or the Synpower if it were me....


2010 Kia Soul 2U - 2.0L I-4, auto; 142k miles.
Castrol GTX HM 5W-30, STP blue bottle; Fram TG 9688.

2009 Pontiac G5 - 2.2 I-4, auto, 121k miles.
Oil/filter TBD
Re: Oil recommendation for a 1986 L98 Corvette, please [Re: addyguy] #1993955
08/22/10 11:35 AM
08/22/10 11:35 AM
Joined: Mar 2010
Posts: 639
Finland
Finn Offline OP
Finn  Offline OP

Joined: Mar 2010
Posts: 639
Finland
Hello!

Update on this matter after almost full driving season (which is about to end soon).

I went with Redline 5W-30 which was available not locally but got that fairly easy. Pressures have been OK, around 450 kPa when doing 60 mph in OD engine fully warm. Warm idle op has been from 250...300 kPa depending on outside temperatures.

What I have noticed is that the engine does consume this a bit. It does not smoke or leave a puddle, just vanishes. Considering the mileage I do each season the usage is not a big issue but I'd still would like to switch to 5W-40 because of it.

I thought all TPI engines have roller cams but that is not the case as they came in -87. Mine is an -86 with iron heads and this has a flat tappet cam so apparently I would need an oil which has heeps of ZDDP, right?

Would off the shelf fully synthetic 5W-40 spiked with extra ZDDP do the trick?

Suggestions are welcome, please.

Last edited by Finn; 08/22/10 11:35 AM.

2000 Jaguar XJR | 1978 Corvette 383" | 1986 Corvette 350" | 2011 K1600GT | 1991 300 SE | 2000 BMW X5 3.0i
Re: Oil recommendation for a 1986 L98 Corvette, please [Re: Finn] #1994075
08/22/10 01:46 PM
08/22/10 01:46 PM
Joined: May 2002
Posts: 21,763
Oakville, Ontario
Patman Offline
Global Moderator
Patman  Offline
Global Moderator

Joined: May 2002
Posts: 21,763
Oakville, Ontario
Originally Posted By: Finn




Would off the shelf fully synthetic 5W-40 spiked with extra ZDDP do the trick?



How about Redline 5w40? I believe it has a pretty high amount of ZDDP.


2018 Corvette, 11k, M1 ESP Formula 5w30 & NAPA Gold
2006 Civic EX Coupe, 150k, PUP 5w20 & Fram Ultra
2010 BMW 328i X-Drive,114k, GC 0w40 & Fram Ultra

Re: Oil recommendation for a 1986 L98 Corvette, please [Re: Patman] #1994572
08/22/10 10:31 PM
08/22/10 10:31 PM
Joined: Mar 2010
Posts: 639
Finland
Finn Offline OP
Finn  Offline OP

Joined: Mar 2010
Posts: 639
Finland
That was the oil I was thinking too but unfortunately they don't import that.


2000 Jaguar XJR | 1978 Corvette 383" | 1986 Corvette 350" | 2011 K1600GT | 1991 300 SE | 2000 BMW X5 3.0i
Re: Oil recommendation for a 1986 L98 Corvette, please [Re: Finn] #1994601
08/22/10 10:58 PM
08/22/10 10:58 PM
Joined: Sep 2008
Posts: 450
Colorado springs Colorado
XCELERATIONRULES Offline
XCELERATIONRULES  Offline

Joined: Sep 2008
Posts: 450
Colorado springs Colorado
Delvac 15 w 40.
Diesel oils have a better additive package for older cars.
Newer automotive oils have most of the additives reduced by the epa.
Diesel oils are exempt.


I use Super Tech Synthetic.
Drive like you stole it!
Re: Oil recommendation for a 1986 L98 Corvette, please [Re: XCELERATIONRULES] #1994808
08/23/10 07:04 AM
08/23/10 07:04 AM
Joined: Aug 2009
Posts: 47
new york state, saratoga cnty
bt99 Offline
bt99  Offline

Joined: Aug 2009
Posts: 47
new york state, saratoga cnty
I use Rotella T5 10-30 in my 89 L98 , which has roller,
but this oil has a great ad pk, and is thick for a 30 .
Great choice for your 86 flat
check the specs

Re: Oil recommendation for a 1986 L98 Corvette, please [Re: bt99] #1994869
08/23/10 08:26 AM
08/23/10 08:26 AM
Joined: Sep 2005
Posts: 14,684
Canada
addyguy Offline
addyguy  Offline

Joined: Sep 2005
Posts: 14,684
Canada
Give Rotella T6 5W-40 a try - great oil at a great price.


2010 Kia Soul 2U - 2.0L I-4, auto; 142k miles.
Castrol GTX HM 5W-30, STP blue bottle; Fram TG 9688.

2009 Pontiac G5 - 2.2 I-4, auto, 121k miles.
Oil/filter TBD
Re: Oil recommendation for a 1986 L98 Corvette, please [Re: addyguy] #1995169
08/23/10 01:27 PM
08/23/10 01:27 PM
Joined: Mar 2010
Posts: 639
Finland
Finn Offline OP
Finn  Offline OP

Joined: Mar 2010
Posts: 639
Finland
Thanks guys. cheers

Unfortunately the Rotella is not available over here, all I see is Shell Rimula such as Rimula R6 in 5W-30 and 10W-40 and Rimula R5 in 10W-40.

How about Mobil 1 Delvac 5W-40 - it's widely available and stocked just about everywhere? I read some source that it has P almost 1400 and Zn 1800. Can this be true?


2000 Jaguar XJR | 1978 Corvette 383" | 1986 Corvette 350" | 2011 K1600GT | 1991 300 SE | 2000 BMW X5 3.0i
Re: Oil recommendation for a 1986 L98 Corvette, please [Re: Finn] #1995815
08/23/10 11:02 PM
08/23/10 11:02 PM
Joined: Sep 2008
Posts: 450
Colorado springs Colorado
XCELERATIONRULES Offline
XCELERATIONRULES  Offline

Joined: Sep 2008
Posts: 450
Colorado springs Colorado

Re: Oil recommendation for a 1986 L98 Corvette, please [Re: Finn] #1995867
08/24/10 01:01 AM
08/24/10 01:01 AM
Joined: Oct 2003
Posts: 463
California
Tremo Offline
Tremo  Offline

Joined: Oct 2003
Posts: 463
California
Originally Posted By: Finn
Hello!

Update on this matter after almost full driving season (which is about to end soon).

I went with Redline 5W-30 which was available not locally but got that fairly easy. Pressures have been OK, around 450 kPa when doing 60 mph in OD engine fully warm. Warm idle op has been from 250...300 kPa depending on outside temperatures.

What I have noticed is that the engine does consume this a bit. It does not smoke or leave a puddle, just vanishes. Considering the mileage I do each season the usage is not a big issue but I'd still would like to switch to 5W-40 because of it.

I thought all TPI engines have roller cams but that is not the case as they came in -87. Mine is an -86 with iron heads and this has a flat tappet cam so apparently I would need an oil which has heeps of ZDDP, right?

Would off the shelf fully synthetic 5W-40 spiked with extra ZDDP do the trick?

Suggestions are welcome, please.


I have an 88 IROC TPI with the roller cam. It also "consumes" some oil but does not leak nor smoke. Since I do have a roller I've been using regular M1. If I had a flat tappet cam, I'd probably run an HDEO.

Re: Oil recommendation for a 1986 L98 Corvette, please [Re: Tremo] #2185535
03/01/11 01:20 PM
03/01/11 01:20 PM
Joined: Mar 2010
Posts: 639
Finland
Finn Offline OP
Finn  Offline OP

Joined: Mar 2010
Posts: 639
Finland
Hello!

As it happens I have the old flat tappet L98 on the floor and a master builder is building me a mild 383" with forged Scat crank and rods, forged Wiseco pistons and AFR 180 heads. This is built on 87-> roller cam block so no more worrying about the lobes. The engine will be mild ie. 350...375 hp but with 475...500 lb-ft.

My question is as follows:

I have noticed that when the power levels rise from the original on built motors also viscosities people use tend to rise. Is there any need for this as the clearances are the same? Several of my buddies seen to run 5...10W-40 or even 15W-50 in this type of built "modernish" late 80s to mid 90s small block Vettes. Is there any need for this or would they do just fine with a quality 5W-30 viscosity oil?

I'm a bit puzzled as the builder said he'd run this new engine with 20W-50 Pennzoil GT.


2000 Jaguar XJR | 1978 Corvette 383" | 1986 Corvette 350" | 2011 K1600GT | 1991 300 SE | 2000 BMW X5 3.0i
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