Hi all,
Ive had my 1990 Eunos for afew months now. Its booked in for a full service and MOT on the 20th of April, but I checked the oil the other day and its looking a little low. Im driving to Edinburgh from London on Saturday, so obviously want to make sure the level is spot on before setting off. I have no way of knowing what viscosity/ type of oil thats in it just now, so can I safely add more oil? Im planning to add some 10W-40 or 5W-40 weight oil, either part or fully synthetic- which would be best for a 21 y/o Eunos with about 80k miles on the clock?
Apologies for the total lack of mechanical knowhow, this may well seem a stupid question!
To be honest I would just give it a service yourself if its an un-known oil, it only takes an hour and dead easy to do. 5W-40 is the more expensive oil and I guess if I had to pick not knowing what is in the sump I would go for that. Personaly I use 10w40 for a similar vehicle but change it regularily. the 5w oil will flow better when cold, both should be very similar when hot. fully synthetic tends to last longer. Some mention the use of 5w30, but to be honest in the older car I would rather have an oil that is a bit thicker when hot.
10w-30/ 10w-40 part synthetic for the mk 1,with an engine flush at service time, full synthetic for the Mk 2’s
Mixing engine oils does no harm, so if you are unsure what’s in there, there’s no need to worry.
A 5w-40 or 10w-40 is fine to use.
http://www.opieoils.co.uk/c-656-5w-40.aspx
Out of those, the best ones are the Fuchs/Silkolene Pro S, Motul 300V, Redline and Gulf Competition. The Motul 8100 X-Cess, Millers XFS, Shell Helix, Fuchs Supersyn and Mobil Super 3000 are good, cheaper alternatives.
As a budget choice, a 10w-40 will be fine and I would either go for the Fuchs XTR, Shell Helix, Millers XSS or Motul 6100
http://www.opieoils.co.uk/c-657-10w-40.aspx