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by Joske Vermeule, September 1
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Jun 14th, 2026
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Joined: Nov 2009
Posts: 3
New to Talk Morgan
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OP
New to Talk Morgan
Joined: Nov 2009
Posts: 3 |
Any thoughts on the best grade of oil to use on a 1993 +8?
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Joined: Dec 2008
Posts: 22,362 Likes: 353
Roadster Guru Member of the Inner Circle
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Roadster Guru Member of the Inner Circle
Joined: Dec 2008
Posts: 22,362 Likes: 353 |
If in doubt, I look at the Halfords flip chart. Go for the equivalent age RR V8. I'm guessing it will list 5w-30 or 5w-40. The Rover V8 is not designed for high spec fully synthetic. For years I ran my '74 3.5 on Valvoline 20w-50, then switched to Castrol Magnatec which from memory is a 5w-40.
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: Dec 2009
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Tricky Dicky Member of the Inner Circle
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Tricky Dicky Member of the Inner Circle
Joined: Dec 2009
Posts: 37,418 Likes: 978 |
When I was running my 94 +8 the best advise was to use a standard 20 - 50W. Halfords still sell Castrol GTX which fits the bill. Apparently it's not such a good idea to use synthetic oils on the old (design) Buick block. Go-Mog has a fair bit of useful information on this topic. Enjoy your V8. Please see attached link :- http://www.gomog.com/allmorgan/plus8oil.htm
2009 4/4 Sport Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Con Green +8 prev
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Joined: Dec 2008
Posts: 22,362 Likes: 353
Roadster Guru Member of the Inner Circle
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Roadster Guru Member of the Inner Circle
Joined: Dec 2008
Posts: 22,362 Likes: 353 |
4/4sportsfun - yesterday on Mogtalk, it came up that Google street view shows a grey 4/4 Sport at the top of Countisbury Hill,(just east of Lynmouth) with the owner taking a photo. Was it you??
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: Jul 2007
Posts: 27,813 Likes: 749
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 27,813 Likes: 749 |
Why not try Holden
http://www.holden.co.uk/displayproducts.asp?sg=3&pgCode=016&sgName=Maintenance&pgName=Oil%2C+Grease+%26+Fluids&agCode=0160&agName=Classic+Castrol+Oil
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Joined: Dec 2009
Posts: 37,418 Likes: 978
Tricky Dicky Member of the Inner Circle
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Tricky Dicky Member of the Inner Circle
Joined: Dec 2009
Posts: 37,418 Likes: 978 |
Hi Dave No it wasn't me mine is Le Mans green - I'm too traditional I know, the +8 was Connaught of course  . Cheers Richard
2009 4/4 Sport Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Con Green +8 prev
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Joined: May 2010
Posts: 220
L - Learner Plates On
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L - Learner Plates On
Joined: May 2010
Posts: 220 |
........Apparently it's not such a good idea to use synthetic oils on the old (design) Buick block......
I second that, and also note that whatever oil you use should have adequate ZDDP additive. This may not be an issue in UK/EU, but here in USA most current engine oils don't have enough because they took out the additive citing potential cat. damage..........to quote Lorne at Gomog: Flat tappet engines require ZDDP. Of course flat tappet engines are no
longer produced for many years (outside of farm equipment and your Plus 8 V8) In 2004, the US government phased in a requirement for manufacturers to guarantee a catalytic converter life of 10 years or 100,000+ miles. As ZDDP, the most common engine additive since the 1920s, can coat cats over a long period, the US car manufacturers, pressured the oil companies to remove it.
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