Has anyone had any issues with their cars because they chose the wrong oil? Can't recall reading anything despite all the oil threads! I have had my 300D for 25+ years (dino originally, later Mobil 1)

Personally, I wouldn't spend money on oil analysis unless I was operating a trucking fleet. Just change the oil and filter at regular intervals and the old diesel will be happy

On these old cars, maybe $30-$60 once or twice a year for oil changes using basic dino oil ($10/gal?) or Walmart synthetic at $25/ 5qt jug. IMO, not worth spending money to save a few $$ on oil changes.

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5

Oil analysis can you tell you more about your motor than just how the oil itself is doing. I change my oil once a year regardless.

Sorry but synthetics absolutely are better in all ways but price. Even if you want to argue about them until you are blue in the face you can't deny too major things: In cold weather they will radically change the way many engines start. AND The overwhelming preference of syn. oil by engineers who make today's high-end performance engines and cars. Check out any performance car owner's manual.

Another example: I worked at a college and a lab professor/car geek did his own tests comparing Amsoil to good, normal oils. You could watch him pour-test frozen oil samples and the Amsoil was sometimes the only one that flowed at all and always flowed many times faster.

And to not worry about what is in the oils is kinda like finding all foods are removing vitamin B. Sure you may not notice it for a long time but big problems will arise soon enough.

We have fuel that no longer has sulfur, which we need, and oil that is losing built in lubricants. This is an issue, like it or not. I guess grease is still safe, for now.

Great information!! Sometimes though, we come across people who refuse to change their minds no matter how convincing the evidence is. I'll continue to pay a bit more for Amsoil because in 20+ years of use it has never let me down. Great product, great company, great customer service!!

Quick story. I recently bought the 2 1/2 gallon Amsoil 15W40 Marine Diesel Oil from my local distributor. Nice guy that he is, he threw in a nice fill spout that screws onto the bottle, approx $5 his cost for FREE. It sure has made filling the car with oil a lot easier and everytime I use the oil I think of him. Sometimes throwing in a freebie on a sale creates customer good will.

Think of the oils that were around when these engines were designed and built, and think of how many miles they put on the odometer with no issues on that oil. Modern oil has come a LONG WAY since then. Use the right spec oil from a major manufacturer, change it when you're supposed to, and worry about other things.

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617 swapped Toyota Pickup, 22-24 MPG, 50k miles on swap

Been using the Mobil 1 15w-50 here. Does great in my old W115.