* previous recommendation of 5w30

 

Synthetic oil making motors leak is a myth.

True when they first started to put synthetic oils in motors years ago it did make the seals shrink. That was quickly fixed.

I have been using synthetic in all my vehicles. with no problem regardless of mileage. Oil is cheaper than motors so put in the best I can buy.

 

Bhduck. X2

 

Hmm never knew this thanks... I just can't see me putting in a light vescosity

 

Right another thing ppl don't know is there isn't that big of a diff in the 5w30 and the 10w30 the 5w30 at cold temp viscosity is 10.6 and the 10w30 at cold temp viscosity is 10.5. Yes you read that right the 10w30 is actually thinner at I believe 32 degrees but the 5w30 in a much much colder weather will be thinner

 

And in the end it's still just 30 weight at operating temP

 

but if the motor has any leaks even small wont synthetic leak worse?

 

I think you guys are overthinking this. We're talking about a 21 year old truck with 200,000 miles on it. Honestly, I would just put conventional 10w30 in it and be done. Even today's cheap conventional oils have a much better service rating than was recommended for that engine back in 1990.

If we were talking about something newer with low miles, I would say go synthetic.

 

but it also comes down to some people running longer intervals on their oil which synthetic would be better

 

I've been running Motorcraft Synthetic Blend 10w30 changing it at 3k mi. No problems, and I still have pretty close the factory oil pressure. I have an aftermarket gauge.

 

This^^^

I run Mobil 1 extended performance 15k mile oil with M1 EP filter and change at 10k.

I also put it in my dads 07 F150 and moms 05 avalon and change at 15k.

Oil has come a long way and I personally feel changing at 3000k miles is wayyy too early.

 

Either way whenever u change your oil with whatever oil you chose just don't get a fram or microguard filter lol

 

when I first bought my truck, one of the first things I did was change the oil and used Valvoline full synthetic and my oil pressure gauge was reading funny the whole time I had it. I changed it to the Motorcraft synthetic blend and wasn't happy with that either. I just use Valvoline high mileage 5w30 in winter and 10w30 in summer. I think when these engines were designed, they weren't designed to run on synthetic so I just stick to what the manual says.

 

This is not true. I had two trucks with 100k+ on them when I started using mobil 1 full synthetic. Neither leaked a drop before I changed. Within six months, both developed serious leaks. I was losing almost 2 quarts between changes.

 

why is it that everyone is so against fram filters. my family has been using fram filters for over 40 years and never had any problems with them