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Here is my first UOA in my 2004 VW Jetta 2.0 N/A at 3k miles with 120k miles. Tons of city driving in heavy traffic, I am planning to do another UOA at 6k.

I live in Venezuela, the country with the biggest oil reserves in the world but a quart a conventional oil costs more than 7 USD, the minimum wage isn´t enough to buy a quart of oil by the way

Does the Distributor Cap and Rotor need to be replaced? My 290k miles car has original distributor cap, rotor and wires and runs strong without any problems. Would I see any benefit changing those items even when my car is running perfectly?

Is the fact that the center of the spot is clearer than the medium ring a good or a bad thing? Both spots were taken at the same time, I wanted to compare 2 drops vs 1 drop. 288k miles 7AFE Corolla 2500 miles on Oil with 2 qts of Makeup

I recently posted on this forum that I had a problem of loss of coolant, there wasn´t any leaks and the radiator cap seemed to have been working properly. Coolant expansion tank boiling, many people pointed that my problem could be related to my head gasket. Yesterday my car lost compression...

I have a 1999 Fiat Uno, it is carbureted and has a 1297 cc engine that loves to rev thanks to it´s dual barrel weber carburetor. Because of the way I drive it I´m getting 15 MPG, that is so funny for me. Isn´t that fuel consumption American V8 Truck territory?

I have a 01 Corolla with almost 290k miles, it´s thermostat have been removed I know that I should buy and put one again but I can´t afford it and I will stick with the consequences, I live in Venezuela and hyperinflation is crazier than you will ever be able to imagine so please focus on the...

I want to start perfoming blotter spot tests every 500 miles to see how the oil is perfoming on my car, I know that this kind of test can´t replace a UOA but I want to start getting used to this kind of test so I can know when a specific oil brand is performing worse than others. What procedure...

I recently started a post asking if an Italian Tune Up is really benefitial for a engine, I got answers from various people saying how hard you have to drive the car for it to be benefitial and to be called a ITU, but this reports were a little confusing for me because they went against my...

I have a 99 Fiat Uno with only 43k miles on the engine, the Owner´s manual recommends a 6k miles OCI using a API SH 15w40 oil, but where I live we are used to 3k OCI. I´m currently using a CI4/SL rated 15w40 and I would like to extend my OCI because I think that I´m using a way better oil than...

I have a 286k miles 01 Corolla, it has used 20w50 oil its entire life. Can I use a 10w30 oil after so many years of thick oil?

My engine oil looks almost transparent when the engine is at operating temp and it looks slightly dark when the engine is cold. What causes this? The oil additives are the ones responsible for this I guess. And also the dirt falls down in to the pan when the engine is cold. What are your thoughts?

Is there any proof that an Italian Tuneup is benefitial to an engine? Does it really reduces deposits on the combustion chamber and helps to reduce them also on the piston rings? Would you consider a 5 minute 3500 rpm run an italian tuneup?

I have a 01 Corolla with a 5 spd transmission and I would like to change the transmission oil, the owner´s manual calls for a 75w90 GL4 oil and I can only find a 80w90 GL4 and a 75w90 GL5, I have read that GL5 should not be used in transmissions that call for GL4 oil so my only option is 80w90...

I have a 01 Corolla (with an 7AFE engine not the 1ZZFE) with 285k miles. It´s burning 1 qt of oil every 1300 miles which is acceptable for me. I can get a Synthetic 5w40 Oil almost at the same price of the Dino HDEO 15w40 oil that I´m currently using, the HDEO is API SL rated and I can get two...

Does a PCV delete and Vented Oil Catch Can setup worsens or improves the life of the Oil? Is the vacuum of the Intake Manifold needed for proper extraction of the condensation and contaminats of the oil? Are there any UOA results that shows improvements with a vented Oil Catch can?

Would you stop changing oil in a engine that burns 1 qt of oil every thousand miles if you wanted that engine to last as much as possible?

I have a 01 Corolla with 285k miles, I have always used an API SL 20w50 Conventional oil and a 3k mile interval. When I began to browse through this forum I decided to start using an API CI4/SL rated 15w40 oil because I learned that a thicker oil isn't always the best option. My car is using 1...

I browsing on this forum and I found this article: Thinner oil provides better oil seal where an User called autoreign said this: Quote: The article seem suggest that the oil flow on the piston rings pack is more likely to flow through the gap on each piston ring to get to the top ring. Hence...

Hi everyone, I have a 285k miles 01 Corolla with a 7AFE engine that is consuming oil. At the 250k miles the engine has overhauled with new piston & rings, bearings, gasket and seals but the block wasn´t bored in a machine shop because it looked in good shape, it didn´t had any ridge in the top...