Ce ulei folositi?

[ParuLuScorilo]

@catalinux

http://www.carbibles.com/engineoil_bible.html#dieselflush

Using Diesel oil for flushing
A question came up some time ago about using diesel-rated oils to flush out petrol engines. The idea was that because of the higher detergent levels in diesel engine oil, it might be a good cleaner / flusher for a non-diesel engine. Well most of the diesel oil specification oils can be used in old petrol engines for cleaning, but you want to use a low specification oil to ensure that you do not over clean your engine and lose compression for example. Generally speaking, an SAE 15W/40 diesel engine oil for about 500 miles might do the trick.

si mai jos:
Can I use diesel engine oil in my petrol engine?
This is an awkward question to answer. Diesel engines run much higher compression ratios than petrol engines and they run a lot hotter, so the oil is formulated to deal with this. Plus they produce a lot more dirt in terms of combustion by-products. Diesel-rated oils typically have more detergents in them to deal with this (see Using Diesel oil for flushing above). It's not unheard of for diesel oils to clean a petrol engine so well that it loses compression. Diesel-rated oils also have an anti-foaming agent in them which is unique to diesel engines, and not needed in petrol engines.

[catalinux]

Si unde spune ca nu trebuie folosit un ulei cu TBN mare? Mai mult decat atat, daca as merge pe filozofia ta Castrol Edge Turbo Diesel ar cadea si mai mult in dizgratie datorita unui TBA mai mic (7.4) decat al unui ulei slab Petrom (8) pt motoare pe benzina. Dar nu este cazul...

Uite ce zic cei de la API:
" Total Base Number (motor oil test - ASTM D-2896):
Total Base Number (TBN) is the measurement of a lubricant's reserve alkalinity, which aids in the control of acids formed during the combustion process. The higher a motor oil's TBN, the more effective it is in suspending wear-causing contaminants and reducing the corrosive effects of acids over an extended period of time.The high TBN allows it to effectively combat wear-causing contaminants and acids, providing superior protection and performance over extended drain intervals."

Si inca o definitie, poate mai exacta:
"The Total Base Number (TBN) is a measure of the reserve alkalinity of a motor oil and how well the oil can neutralize harmful acidic by-products of combustion. The detergent/dispersant additive package is critical in determining how effective the motor oil is in neutralizing these acids. TBN depletes with time in service. Higher TBN oils are more effective at neutralizing acids for longer periods of time. In engine lubrication systems that use by-special pass filtration systems and do not change oil, TBN is monitored through oil analysis testing and also maintained by replenishing oil added during filter changes and topping off the oil.
A more specific explanation of TBN and TAN is as follows and is repeated as specified by Exxon Mobil. It is very important that you understand TBN: TBN is the quantity of acid, expressed in terms of the equivalent number of milligrams of potassium hydroxide, that is required to neutralize all basic constituents present on one gram of oil. This test is normally used with oils that contain alkaline, acid-neutralizing, additives. The rate of consumption of these additives (TBN depletion) is an indication of the projected serviceable life of the oil. With used oils, it indicates how much acid-neutralizing additive remains in the oil. Typical oils of this nature include diesel engine oils for internal combustion engines that use fuels containing acid-producing constituents such as sulfur or chlorine. As long as any significant amount of TBN remains in the oil, there should not be any strong acids present."

[ParuLuScorilo]

nu e a mea filosofia, e a lu' ala de a scris acolo. Tot pe acolo zicea ca producatorii nu dau o masura a nivelului de detergenti in fisa tehnica, dar poti sa-ti dai seama dupa TBN, cu cat e mai mare, cu atat si nivelul de detergenti e mai ridicat.

E un material interesant de citit, cu rezervele de rigoare, ca prea ridica in slavi uleiul ala de-l lauda el.

[darksid3]

Bai gata...m-ati "enervat"...Mobil 1 0w40 bag data viitoare. De-al dreaq

[ParuLuScorilo]

Bai gata...m-ati "enervat"...Mobil 1 0w40 bag data viitoare. De-al dreaq

in logan, sau in viper?

[catalinux]

@Scorilo, am citit pagina aia din carbibles de mi s-a urat. Imi place cum scrie tipul si le mai zice si bine. Ideea este ca un TBN mai mare neutralizeaza mai eficient acei detergenti "daunatori".

@Darkside, Mobil1 0w40 are un V.I. de 186 !!! (doar Motul 0w40 il mai atinge) si cel mai ridicat T.B.N. (11.3).

L.E.: Am vazut o greseala. Sub Valvoline 5w40 este Motul X-cess 5w40, nu Mobil. {darkside, cand ajung acasa o sa-ti retrimit pe p.m. chart-ul corectat si te rog sa ma ajuti sa-l inlocuiesc. mersi}

[darksid3]

In Logan bineinteles...mereu imi place sa sfidez logica

[ParuLuScorilo]

bazele neutralizeaza acizii. TBN e o masura a bazicitatii. Detergentii am impresia ca au caracter alcalin. Cum neutralizeaza bazele alte baze???

din ce am inteles eu, TBN masoara gradul de detergenti din ulei. Asa e? Ne ajuta vreun specialist?

[Octavian]

La benzinar nu e problema cu TBN-ul (daca e prea mare ti-l curata de-l ia dracii )
La dizal e bine sa fie cat mai mare.

[GMR]

deviez putin de la subiect...am luat un mobil 5w-30 esp formula pe care o sa-l testeze motoru zilele astea...ma gandeam insa cum e mai bn sa fac...sa-l schimb la an sau cand o sa fac ceva mai multi km avand in vedere ca uleiu este mai bn si merge lejer 15000...???

[Octavian]

Daca nu mai ai treaba cu garantia, nu-l schimba la un an, schimba-l pe la 20-22000 km (dar parerea mea sa nu depasesti un an jumate)

PS: in Germania BMW are interval de schimb la 30000km cu uleiu asta (inclusiv dizal)

[D-FENS]

Daca nu mai e in garantie schimba-l la 15000

[achim]

Intrebare

Ce ulei sa folosesc la loganul meu de 1,4 cu 23500 km,sunt nou pe site

[emanu900]

Ce ulei sa folosesc la loganul meu de 1,4 cu 23500 km,sunt nou pe site

Pune Mobil 1 0w40 New Life din generatia noua. Ai sa vezi ce fain toarce. E tanar motorul tau, pana la 130.000 km numai din asta mai subtire. Pe urma treci la norma 5wYY

[Octavian]

As merge in continuare (cum am facut) pe 5W30 Castrol sau Mobil1 , dar de ala scump .
0W40 poate dupa 60000 km, dar momentan n-are rost sa-i dai asta.

PS: mai ales cand vad motor de Ford Puma 270.000 km 1.7 120 cp care a mers numai cu 5W30 Liqui Moly (german, nu varf de gama).