earckens Posted August 10, 2019 Report Share Posted August 10, 2019 (edited) For gearbox and/or transmission I can get either of the following, but which is recommended: 1. Millers Oil Classic Pistoneeze Gear Oil EP GL4 140W 2. Millers Oil Classic Pistoneeze Gear Oil EP GL4 80W90 Or is something else altogether required? I searched the forum but either I can't get the search terms right or I get hundreds of irrelevant pages, sorry! Edited August 10, 2019 by earckens Quote Link to post Share on other sites
Lebro Posted August 10, 2019 Report Share Posted August 10, 2019 GL4 80W90 would be fine for back axle, but better off with a non EP gear oil say sae 40 for the gearbox. Bob. Quote Link to post Share on other sites
RogerH Posted August 10, 2019 Report Share Posted August 10, 2019 Hi Erik, as per Bob's comments. Your choices are too thick/heavy for the gearbox and or Overdrive. Penrite GB40 is ideal for gears. But heavier oil is fine. Originally the EP oils were seriously not good for the GB/OD but have improved over the years. Stay with a GL4 spec oil The Moss Dynalite looks like a good range of oils from 30 to 140. My choice for the GB/OD is Penrite GB40 Roger Quote Link to post Share on other sites
Kevo_6 Posted August 10, 2019 Report Share Posted August 10, 2019 I use Penrite GB40 also. Quote Link to post Share on other sites
earckens Posted August 10, 2019 Author Report Share Posted August 10, 2019 (edited) Thanks for your replies! I can get Castrol GP SAE50, lower viscosity my supplier does not stock: should I better get another supplier (I definitely want the best)? Edit: there is an overdrive in the transmission Edited August 10, 2019 by earckens clarification Quote Link to post Share on other sites
monty Posted August 10, 2019 Report Share Posted August 10, 2019 Penrite Gear 40 for gearbox/overdrive. Millers EP GL4 80/90W for the rear axle. Exactly what I have used for years in 2 cars with no problems. Quote Link to post Share on other sites
RogerH Posted August 10, 2019 Report Share Posted August 10, 2019 Hi Erik, do you know what GL spec the oil is. I can;t see it on my searches. It does state that it is an engine oil - maybe not the best for GB and OD. Roger Quote Link to post Share on other sites
earckens Posted August 10, 2019 Author Report Share Posted August 10, 2019 6 hours ago, RogerH said: Hi Erik, do you know what GL spec the oil is. I can;t see it on my searches. It does state that it is an engine oil - maybe not the best for GB and OD. Roger Hi Roger, thank you for your reply; this is the Castrol SAE50 in question (in dutch, some text may be understandable, however: sorry for this!): https://www.misteroil.be/nl-be/shop/product/747/castrol-classic-gp But indeed, it is an engine oil.. So I better look elsewhere at a different supplier. Quote Link to post Share on other sites
Allan Westbury Posted August 21, 2019 Report Share Posted August 21, 2019 I concur that Penrite GB40 works well in my 4A gearbox. Allan Quote Link to post Share on other sites
John Morrison Posted August 21, 2019 Report Share Posted August 21, 2019 SAE 40, I use Morris, no issues in years. John. Quote Link to post Share on other sites
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