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Hi, mangler - Welcome to the world of BITOG Perhaps you could consider Delvac 1 LE 5W-30. This is a very modern and competent lubricant which has API's CJ-4/SN Compliance amongst many others

Hi, sam369 - I can assure you that Castrol's Transmission lubricants are amongst the very best at any price They do make a diverse range for various applications so I'd stick with what is recommended

Hi, I endorse wholly MolaKule's recommendation. Sulfur additive based older lubricants build up a residue that once removed certainly can cause seal seepage/leakage - this is typically attributed to a change to a synthetic lubricant

Hi, JStep - Welcome to the BITOG Forum. I hope all Members will be helpful and that you enjoy our company Exxon-Mobil's Delvac product range is designed for Commercial use and has been around for many decades. MX carries various Approvals etc. and if it meets the requirements of your engine it...

Hi, Camprunner - It really won't matter at all. The 10W-30 viscosity has been an enduing and popular one amongst OEMs since the 1950s and in the case of M1 is no doubt a "Signature" product - and most likely their best seller One Poster prominent in this Thread and elsewhere on BITOG is simply...

Originally Posted By: kschachn Do gear oils even worry about TBN? I wouldn't think they do, and I bet they perform well in this test. That alone would prove that TBN retention additives (whatever they are) play no meaningful role in the wear test. Hi, TAN is a significant condemnation factor...

Hi, Pontual - Whilst it’s true that some Centrifuge filtration systems perform better than others, all are a quantum leap forward over a full flow filter in maintaining engine lubricant condition via the removal on contaminants. They are also demonstrably better than the normal barrier type...

Hi, 2010_FX4 - Typically an increase of 2 in TAN over new lubricant reading is the signal for changing it out

Hi, Originally Posted By: Pontual Some Centrifuge filters are considered too harsh on heavier weight additive package, like AW and VII, and silicon antifoamers, sending some out of mix, by separation. That's a quicky depleter. Please provide some factual evidence (Make of Centrifuge etc.) to...

Hi, Pontual - Choosing the correct product as recommended by the OEM is important - especially regarding the HTHS viscosity Engines are designed around such things!

Hi, Mainia - You could consult with the OreLube Corporation who manufacture speciality lubricants - based in New York My first contact with OreLube was in 1975 - they were manufacturing synthetic engine lubricants at that time

Hi, Originally Posted By: fdcg27 This is what I recall from my old MGB. 20W-50 was among the grades recommended for the engine in hot summer weather, but not for the gearbox. You've written in the past that the 20W-50 grade was developed for a very specific application. How can it be that this...

Hi, Wampahoofus - When these vehicles were new BMC (MG) recommended a SAE30 engine oil. In my case we always used a Castrol product of the era but never 20W-50 - IIRC we used Castrol's XL 20W-30 It seems that around 90/11.5 would be the viscosities you need and seeing that you are...

Hi, expat - yes, Castrolite (20W-20), Castrol XL (20-30 were the benchmark products. SAE20 and SAE30 were popular. Castrol's XXL (30-40) was used in some oil burners. 10W-30 came on board during the mid 1950s Many older US cars used SAE20 or SAE30 prior to 10W30 being sold

Hi, Originally Posted By: Claud In the UK in the '60s 20w50 was the oil recommended by most mainstream manufacturers. Perhaps the design engineers recognised that much of the time the cars would be making short journeys with the engine not properly warmed up, and were for compensating for...

Hi, addyguy - I commenced using HDEOs (HD oils) in petrol engines in the late 1950s due to their reliable quality and performance in testing. Previously I had been well educated on Castrol & Caltex non HD products of the time. Into later years I never thought of HDEOs as a "poor mans...

Hi, Originally Posted By: Bandito440 Are there many people using expensive synthetics in OTR trucks? Would there really be a good return on investment over plain ol' 15w-40? I've posted much on this subject over the last decade. In Australia lubricants are very expensive and my Fleet's...

Hi, Originally Posted By: d00df00d Originally Posted By: stygz I didn't know that. With all the UOA they do would you not think they would be able to tell if something was not right with the info they have from the customer and the test results? A UOA is like a doctor visit. Your doctor's...

SrChief; You said this; Originally Posted By: SrChief Suggest you change to Pentosin HP II 5w-40 and be done with it. I would like to welcome you to BITOG but I'm mystified as to why you would bring up an old thread and not even answer the OP's question? Not really a good way to commence...

Hi, expat - I agree Originally Posted By: expat So the Diff has 75k on it and the oil may have been changed at least once. How is this neglected? Heck, I have put many times this mileage in a Diff or Gearbox, on Factory fill, and not changed the oil. I used a "life time" OCI programme for...