Conventional vs. synthetic oil for 2009 TRD manual at 155k miles?

I've got a 2009 V6 TRD Off Road MT (Access cab). 155,500 miles. Dealer always does the oil changes.

I'm due for an oil change and wondering if I should be switching to synthetic oil to help prolong the life of the engine, or to help with MPGs?

I called the dealership before making an appt. but I couldn't get anyone in the service dept. to give me a real POV. So thought I'd come here. Thanks!

5 year old pic for attention. I have better tires on there now, and yes, it's silly that I feel the need to caveat that.

 

Synthetic is basically the same price. Better lubrication, less breakdown.
From the word I've heard the 4.0 V6 is very agnostic for conv - blend - synthetic, and some varying weights.
Personally, synthetic makes me feel better, Pennzoil Platinum FS or HM 5w-30 with an OEM filter @5k miles.
It is one of the easiest vehicles to change the oil on, check out some threads on here about it.

 

Synthetic. No need for conventional anymore. Same price and far superior. Get Valvoline high mileage. Add package data for that stuff exceeds anything out there aside from booji oils.

 

There are no downsides to switching. I doubt it will make a measurable difference in fuel mileage and if it makes the truck engine last longer it would be impossible to prove. But synthetic does lubricate better and last longer. The biggest advantage is that you can go longer between oil changes.

 

conventional if the calendar says 1970

DIY in a parking lot is free and comes without mandatory dealer bellypan thread stripping $ addon

 

One of the easiest vehicles to change oil on so why are you still paying someone else to do this? Put a fumoto valve on the oil pan to avoid confusing it with the trans and you can change the oil in your pajamas in 15mins without using any hand tools. Just a oil pan and an empty small water bottle to catch excess drip under the oil filter. For me, I change the oil every 3-5K miles using the cheapest oil on sale. Dino, semi, or full synthetic. Makes zero difference and never an issue in all the vehicles I have ever owned.

 

last time i started draining underneath and i took a sharp splicing knife and a hammer and sliced a hole in the top of my toyota oem filter... and when i got done draining and put the plug back in underneath, i pulled the filter and it was completely dry, no drip no mess at all. definetly doing it every time. easy oil change vehicle... what do you pay for the service at the dealer? you can buy a nice drain pan on line for under 20 and just a little more for 5 quart jug and oem filter. I dump the old oil right back in the original container and garbage company picks it up every 2 weeks. Although in my circle of friends hardly anyone changes their own, their time is too valuable, they just go to the closest quick lube and pay the man and call me cheap.... till they need their brakes changed... then were solid.