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A friend recently inherited a Harley Evo. It came with engine oil which he is going to continue using for the engine (He thinks his dad was using engine oil in the engine, primary and trans). He has access to Mobil Delvac 1 Transmission Fluid 50 (MT-1 / GL-4) at work which is a 50 (Engine) or 90...

I've seen an oil change interval chart a couple of times. I have no idea of the source. Anyone have an original source on this? 3,000 to 4,000 mi - Frequent trips under 2 mi 4,000 to 6,000 mi - Urban driving 4,000 to 7,000 mi - Typical mixed driving 5,000 to 7,000 mi - Towing 7,000 to 12,000...

I think the Australian market might have been a little conservative about 20 years ago 1998 - 2002 Honda Accord J30A1 USDM -Export 5W-50 -40 to 0C 10W-50 -20C to 30C 25W-50 0C to 40C Conventional 6000 km maximum Synthetic 12000 km maximum The chart doesn't go there but I'm guessing you...

I keep seeing posts where people denigrate buying oil that meets a spec higher than the minimum standard in the owners manual. Has someone seen studies that give support to this position. To me it seems dubious that the higher standards for wear, deposits, corrosion and lubricant stability...

It was a data error. The manufacturer straightened it out. Mistakes happen.

I'm somewhat baffled by the purpose of some of the VOA/UOA often posted here. The fact that TBN is still focused on by many is a bit strange considering many major engine manufacturers now have no condemnation limit for TBN. Many oils that pass manufacturers test now finish with less than 1.0...

Do you have a movie that you particularly love that's never drawn big attention? For me it's "Finding Forrester" (2000) with Rob Brown and Sean Connery.

Sometimes it's the little things in life (inconsequential as they may be) that just make your day. Just had a couple of hotdogs for lunch. Woeber's Horseradish Mustard (Stoneground Mustard and Fresh Horseradish). It just makes a hotdog for me.

I have heard the Quaker State Ultimate Durability Synthetic was relabeled as the new Pennzoil Full Synthetic. So what is the current Quaker State Full Synthetic in the green jug with the gold label? Is it the same as the base Pennzoil Full Synthetic or is it the old Shell Synthetic or something...

The world has gone insane. Car Max 2010 Ford Ranger 45,000 miles No Haggle Price! $25,995.00

How does Mobil 1 Extended Performance work? It's starts out with similar TBN to standard M1 which is around 9.0. ACEA A3/B4 for an extended drain oil requires a minimum starting TBN of 10.0. Any insights into what makes this oil tick?

Mobil 1 HM is SP but it sill isn't GF-6A. Does anyone know if it's still >3.5 HTHS? 100C = 12 cSt 40C = 80 cSt

When a company discloses something like."It's 30-40% GIII" is that generally of the total product or just the base exclusive of additives and carrier oil?

I was looking at the PQiA test dated 10/06/2020 (may be outdated now) Vavoline Maxlife 10W-30 Moly 95 Boron 186 5W-30 Moly Boron 5 Kind of odd.

Different Summer and Winter Grades Car rated for 20 and 30 Grade Typical Summer and Winter Oil Temps 30 grade = 12.33 cSt @ 95C 20 Grade = 12.37 cSt @ 85C Any reason not to run 30 Grade in the summer and 20 Grade in the winter?

Is it considered normal to just start posting on a multiple year old thread if you have a question or comment related to the topic? Seems like a new thread would make more sense? What is the etiquette on this? I keep singing these old threads pop back up after several years of dormancy.

Honda J30A1 V-6 (1998-2002) 260,000 mi 20 or 30 Grade - API Starburst 10F - 100F Ambient Temps It has a few minor leaks from the valve covers and cam thrust plugs (which I am going to repair). I believe what minor oil loss is taking place is primarily leakage. What oil would you run?

What do different basestocks contribute to ring deposits? Petroleum feedstock bases Petroleum derived slack wax feedstock bases GTL PAO POE AN From worst to best how should we expect different basestocks to contribute to ring deposits?

Given shorter intervals (within TG capabilities) what advantages does the new design Ultra have over the Tough Guard?

What is your opinion on storage oil changes? I've always been of the opinion as long as the vehicle was taken for a long highway drive before being stored (to burn off any moisture and fuel) it was fine. I have friends that change the oil before they store for the winter and won't take it out...