Cone8v Posted August 27 Share Posted August 27 Hello, i mentioned before that the engine was rebuilt 12000 kilometers ago (15 k now). Mineral oil was used every time since the rebuild. In the meantime while i was trying to find the cause for the low oil pressure on start. I tried a semi-synthetic oil as ive read somewhere that it might do better. I fixed the low pressure since then, it wasnt the oil that was the problem . Im wondering if i should switch back to mineral. Whats the best oil for that engine and why? Side question: Is mineral oil suitable for hard driving (hitting 7k rpm and staying over 4-5k for periods of time...) I read that semi synthetic is more resistant to temperature and thinning. Should i keep the semi synthetic oil? 1 Quote Link to comment Share on other sites More sharing options...
Sutty2006 Posted August 27 Share Posted August 27 For the Cam in Head engine? 20w50 has all the vitamins and minerals in it that these old engines need 👍 Quote Link to comment Share on other sites More sharing options...
rutts Posted August 28 Share Posted August 28 Just put valvoline racing 20w-50w or 20w-60w. Yes it's mineral too. 1 Quote Link to comment Share on other sites More sharing options...
Jessopia74 Posted August 29 Share Posted August 29 Your right about Semi-synthetic, it’s definitely better than Conventional oils. It does offer better protection What is the ambient temperature that you’re running in when doing the pulls? Quote Link to comment Share on other sites More sharing options...
Cone8v Posted August 30 Author Share Posted August 30 On 29/08/2024 at 02:25, Jessopia74 said: Your right about Semi-synthetic, it’s definitely better than Conventional oils. It does offer better protection What is the ambient temperature that you’re running in when doing the pulls? Probably 30c this summer? Its mostly curvy roads and a couple of straights. I drive her pretty hard, it can get to 37c here in the sun.But winter is coming up soon. Also ive seen no change in the way the engine runs so far. It burns a bit more semi-synthetic oil per 1000km. 2 Quote Link to comment Share on other sites More sharing options...
Cone8v Posted August 30 Author Share Posted August 30 (edited) On 28/08/2024 at 21:58, rutts said: Just put valvoline racing 20w-50w or 20w-60w. Yes it's mineral too. On 27/08/2024 at 19:59, Sutty2006 said: For the Cam in Head engine? 20w50 has all the vitamins and minerals in it that these old engines need 👍 Its a FI cih gsi block with the newer oil pump. 15w40 was used since the rebuild, i tried 10w and saw no real difference so im thinking if i should go back. Are you guys sure 20w50 is the better choice Edited August 30 by Cone8v Quote Link to comment Share on other sites More sharing options...
cam.in.head Posted August 30 Share Posted August 30 you wont notice a difference between 10w and 15w when warm .its the last number that is the hot viscosity. mine will use 15w40 but i use original 20w50 when i can. like the siggestion of 20w60 .that should be good. 1 Quote Link to comment Share on other sites More sharing options...
SCP Posted August 30 Share Posted August 30 I have always used this fully synthetic oil and with the rocker cover off it looks like new inside 🙂 Millers Oils Motorsport Classic High Performance 20w-50 Nanodrive Fully Synthetic Engine Oil 2 Quote Link to comment Share on other sites More sharing options...
Jessopia74 Posted August 30 Share Posted August 30 Bigger the gap the better tbh. So 5W50 will out perform 20W50 in winter, but overkill for the CIH. I would be going for 15W50 Semi-synthetic if it’s a good engine Quote Link to comment Share on other sites More sharing options...
Cone8v Posted August 31 Author Share Posted August 31 11 hours ago, Jessopia74 said: Bigger the gap the better tbh. So 5W50 will out perform 20W50 in winter, but overkill for the CIH. I would be going for 15W50 Semi-synthetic if it’s a good engine 15w50 both for winter and summer? 1 Quote Link to comment Share on other sites More sharing options...
Jessopia74 Posted August 31 Share Posted August 31 7 hours ago, Cone8v said: 15w50 both for winter and summer? It would be more than adequate for the temps your talking about and clearance CIH runs at 1 Quote Link to comment Share on other sites More sharing options...
rutts Posted September 1 Share Posted September 1 You could buy valvoline racing vr1 10/60 synthetic if you fancy synthetic over mineral. 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.