I searched the common Q&A and found nothing, I want to start using the Mobil 1 Extended Performance 5W-30 15,000 mile-protection synthetic oil, just cause i drive a lot of miles and really don't have time to change every 3,000. Does the oil really work for15,000 (i have to admit that this is how long i normally wait on regular oil anyway, but i want to start treating my car better because it has yet to let me down) and also once i drain the conventional oil, do i have to put in some additives or anything? any help would be greatly appreciated.

 

i'd just use normal mobil 1 and 15k oil changes on standard oil....wow, wonder how sludged up that motor is now. i usually go 5-7k on mobil 1 oil after first changing it more quickly the first couple of times, because that oil filter is going to get packed with sludge initially. i did 1k, 3k, 5k, and now 7k on synthetic changes, the first 3 times the filter weighed a ton, gas mileage improved .5pmg as well.

 

Thank you for the advise, and i totally forgot about sludge and buildup i bet the inside of my engine looks alot like a freaking tar pit...well, again, thanks

 

I assure you that it does. I work at a quick lube, and 15k not only is unhealthy, but very damaging to an engine. Pull a valve cover and see all the goo inside there.

 

Its probably ok for young engines that don't blowby and burn the oil. The additives probably last 15k thats why you can use it so long.

 

i don't think an 88 motor is anywhere near a "young engine" at this point. i would buy the cheapy oil filters and swap them every 1-1.5k for a while and just top off the oil for 3k changes for a bit, i'm sure there's tons of stuff being bypassed the filter with such poor oil change practices, especially with how cheap oil and filters are as well.

 

for what it's worth, i run syn.

i have an 2000 explorer with 161k and been running sny. since about 70k. she still uses no oil and shows no smoke. i change every 7,500.

on my z i do the same and it seems ok, although i did just bust a valve spring at 33k but don't see how it could be related.

when i found a test where they were up to 13,000 miles and after testing the oil stated for contaminates it was better than regular oil at 3k i was a believer. if i can find the article will post the address.

oh ya, when we pulled the valve cover on the z the top of the heads and etc looked like new.

 

Follow the links on my site. Yes, the Mobil should last... question is ubder what driving conditions and do they warranty their product?

The ATM 10w-30 Amsoil 25,000 mile oil is only recommended for about 15,000 miles under 'severe duty' driving. If you commute into a big city all the time or have lots of stop and go, you drive in 'severe' conditions for the oil. That Mobil might end up being only good for 7K under those conditions.

 

Also, like these people said, on your next oil changes start changing more frequently so the sludge will come out. Also, before your about to change the oil, dump a quart of ATF in the engine and run it in there for about a day. Then drain it. The ATF almost eats away and breaks down the sludge, and brings it into the filter and bottom of pan. Do this for the next 3-4 oil changes (do it every 1k-2k miles since you normally wait so long) and you should get a decent amont of the sludge out.

 

From http://www.mobiloil.com/USA-English/...ance_FAQs.aspx :

Q: If Mobil 1 Extended Performance is recommended for 15,000-mile intervals, what’s the maximum limit to which it can be pushed? In other words, if a driver goes an extra 1,000 miles or so, is he going to damage his engine?

A: Mobil 1 Extended Performance is recommended for up to 15,000-mile or one-year oil change intervals. However, if your vehicle manufacturer recommends an oil change interval beyond 15,000 miles and Mobil 1 meets the performance level specified, you can be assured that Mobil 1 will go the distance.

Q: Upon what driving conditions are these performance claims based? Normal or severe driving conditions?

A: These claims relate to all typical consumer driving conditions, excluding those mentioned below. In other words, if you drive under normal conditions and use Mobil 1 Extended Performance in your vehicle, the oil is guaranteed to protect your engine for 15,000 miles. We also recommend that drivers consult their owner’s manual while their vehicle is under warranty, and follow the guidelines set forth there. Additionally, we recommend that if consumers drive routinely in severe conditions that they follow the oil change interval recommended in their owner's manual for severe conditions. We define "severe conditions" as:

1. racing or commercial applications;

2. frequent towing or hauling;

3. extremely dusty or dirty conditions; or

4. excessive idling.


No margin there, fellas.

Q: To achieve the best peace of mind related to engine protection, many vehicle owners change their engine oils every 3,000 to 4,000 miles. Is this practice rendered meaningless with the advent of the Mobil high-endurance oils?

Consumers should follow the maintenance practice that is best for them, and that meets their car manufacturers’ warranty. They can have peace of mind knowing the guaranteed performance and protection intervals of the Mobil line of high-endurance oils. Mobil Clean 5000, Mobil Clean High Mileage, Mobil Clean 7500, and Mobil 1 Extended Performance protect critical engine parts from lubricant-related failure for 5,000/7,500/15,000 miles -- guaranteed. (Updated March 2006)


None of this is "news". As the Crimson One alluded to, AMSOIL has been recommending 25k/1 yr oil changes with their products since 1971.

How many of you are using bias ply tires? They last about 10k miles. How many of you change your radial tires at 10k miles? After all, that's all we should have "piece of mind" with.
----------
To quote the same Mobil site:
Q: Do I need to flush my engine before switching to Mobil 1 Extended Performance?

A: You do not need to flush your engine prior to changing to Mobil 1 Extended Performance.

 

nice point,ATF really does work i'v done it

 

Thanks for all the pointers fellas, guess, i'm just going to have to buckle down and give proper maintenance to my bird. This car brings me good luck, for example, when I bought it, I flew to Phoenix (cause i found it online) and then I drove through two states with no license plate (e-z for a cop to have pulled me over) and then two weeks after buying it, i'm checking a fuse and find an eight ball (cocaine 8mg) stashed in the fuse box. (of course the stuff was not mine) If I would have been pulled over on the way my law enforcement career would have been over, needless to say when I found it I turned it into the detective at work, and had my sgt. take it to the international bridge to get X-rayed. The rest of the car was clear, but man, what a stroke of luck, no cop would have believed that I flew to another city to buy a car, drive back with no plates carrying that amount of cocaine. I 'm going to treat this car right.