Synthetic VS Semi-synthetic Poll

I am at the TA and getting full synthetic is $200 more than semi-synthetic. On my last oil change I saved the $200 and did semi-synthetic and averaged 8.6 mpg. I have heard you can get better mileage and extend change intervals with using full synthetic oil. Volvo recommends a 60,000 mile oil change interval for my D13. That scares me a little bit so I think I might need the full synthetic if I want to wait that long.

 

First I wouldn’t let the TA touch the truck.......

2nd full synthetic for cold start protection....

 

I hate the Volvo dealer in SLC so TA it is. I watch them closely.

 

How much does t/a charge for the semi synthetic PM?

 

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For 10 gallons of synthetic blend. (Oil Only)

 

About $300. Full synthetic is $200 more.

 

Full lab oil sampling is the only safe way to determine extended oil drains.

I use semi synthetic at $16/gallon, bypass filtration and change oil based on oil samples, typically 30-50k intervals.

Soot, silicon and wear metals are typically low - base number (acidity) and viscosity generally spur me to replace oil.

A manufacturer recommendation would not scare me.

A TA/Petro/Speedco plunges a hot knife of fear into my core, and lack of samples would twist said knife.

 

Why do you fear Petro/TA/Speedco? I have always got my oil changed at those places and never had a problem. Do you change your own?

 

Detroit is bending me over on filters. My F/W separator is 100 bucks and Donaldson hasn't come up with a approved filter yet. I'm spending 600 bucks on a Semi synthetic PM on a 2018 DD15 knowingly getting gouged. I won't let TA touch my truck but dang. I changed the oil on my 60 series myself but this one nope. No wonder people trade these pos in when the warranty is up.

 

Yes I do.

I know of a half dozen horror stories from the chain stores.