Flush needed Changing Mineral to Synthetic Motor Oil?

Most parts guys and techs I've asked insist that a proper flush (with a specific flush additive) is vital in order to change over to synthetic motor oil.

Personally, I have never made the switch in any of my vehicles so I've never tried to "disobey" their advice. Though, I doubt that I would, as it is fairly simple to do a proper flush. Yeah, you waste some oil and spend a few extra bucks, but you only have to do it once.

So, it seems worth it rather risking any potential problems from not doing it properly.

 

You will just be wasting perfectly good oil. just change the oil and drive the car. If you are worried that the oil will not perform as well, as if it had 100% Mobil One in it, then change the oil at 7,500 miles. Then the next oil change you can go to 10,000.

 

You are getting scammed by know-nothing parts guys and techs.

 

Hello, seems like a waste to me, then it may depend on the mileage of the engine. Now I now hes just talking about a simple oil transfer, but Ive used the flush where you let it run for 5 min. in a can on a high mileage truck, turned out to be a disaster plugged everything up oil valley and pump screen.

 

What a shock! LOL..........wouldn't be the first time that the "self-proclaimed experts" in the auto business were full of BS

 

I'd run the Mobil for about 2,000 miles and then drain again.

After that you can go to 7.5K-10K mile intervals.

A quick flush will do little. You need to get the oil to flow and to temp for it to have any cleansing effect.

 

Is this actually true though? I've been told otherwise. Synthetic oil gets dirty just as fast as mineral oil, the difference, I was told, is that synthetic provides better protection at higher temperatures. So you shouldn't necessarily be extending the time between changes. Also heard that it isn't good in older engines so I stopped putting it in my BMW. Don't know if this is true or not but I just couldn't justify the significant extra expense when the benefits were not definitive.

I'm new here, I'm guessing this is a topic that's been discussed extensively in the past. I need to do a search on it. I'm not doubting synthetic is better, but I'm not sure it's necessarily better in every vehicle or to allow for fewer oil changes.

 

Some motor cycle engines would come with std oil for break in and be changed to synth at 1st service, don't think they did anything exept drain change filter and refill.


Russell

 

There are many oils on the market that are a combination of mineral and synthetic already to help you in this transition.














Sorry couldn't resist

 

If you are actually concerned with the change over, all you really have to do is to fill it up with synthetic, drive it for a couple thousand miles, then change it again. You get to choose when to change it again based on $$$ wersus fretting.

 

Uro- Should cause no harm. I had four new Jeeps and always changed them over to Mobil-1 after they had 1000-1500 miles on them. Just drain the old oil when hot, change the filter, add new oil and you are good to go. I always change my oil at 5000 miles or one year intervals anyway, and the small amount of conventional oil left in the nooks and crannies will not cause any problems. Your truck holds way more oil than the Jeeps, so the oil will be purer than it was in my Jeeps.

Taz
Terry Phillips

 

It is required by Federal law that ALL motor vehicle motor oil be compatible.

You can mix synthetic and dinosaur oil quite safely.

 

Uro- Actually, you work in crannies, so here is an increase in your professional vocabulary with which you can impress your clientele.

Main Entry: cran·ny
Pronunciation: \ˈkra-nē\
Function: noun
Inflected Form(s): plural crannies
Etymology: Middle English crany, from Middle French cren, cran notch
Date: 15th century
1 : a small break or slit : crevice
2 : an obscure nook or corner

Fits really well with what you do, no?

Taz
Terry Phillips

 

Uro- Eminent cranniologist. You are right on Dr Haas. He did a lot more damage doing that than leaving a little Shell in the oil lines.

Taz
Terry Phillips

 

Back when I got my 1st new car in college, a friend told me to run the car for few seconds with no oil fiilled in every oil change to make sure all the old oil are completely drained, but I never listened to him. That guy later on lost his oil drain plug on his Rambler on a drive to school, his engine seized up.

As for the new car that got in college in 80's, I put Mobil 1 synthetic in it from the 1st oil change, the last time I heard is someone was still driving it with some 300,000 miles on clock. Back then a quartz of Mobil 1 cost around 3 bucks, it was expensive for a poor student, but I changed oil every 10,000 miles or so.

 

It seems to me that for street-driven engines the only clear advantage of synthetics is that they have wider viscosity ranges--- so they flow better at startup. With a really expensive engine it therefore might make sense to use it.
But, yes, they get dirty just as fast. So unless you are doing those 10,000 miles in long journeys on freeways without a lot of dust around, you will need to change it before 10K anyway.