<PAGE>
Exhibit 20.6
Page 1 of 3
Navistar Financial 1999 - A Owner Trust
For the Month of August 2000
Distribution Date of September 15, 2000
Servicer Certificate #16
<TABLE>
<S> <C>
Original Pool Amount $714,764,750.47
Subsequent Receivables (transferred 6/3/99) $0.00
Beginning Pool Balance $451,619,634.81
Beginning Pool Factor 0.6318437
Principal and Interest Collections:
Principal Collected (Incl. Servicer Advance Repay) $15,963,587.77
Interest Collected $3,177,224.35
Additional Deposits:
Repurchase Amounts $0.00
Liquidation Proceeds / Recoveries $1,150,961.70
Total Additional Deposits $1,150,961.70
Repos / Chargeoffs $1,348,447.58
Aggregate Number of Notes Charged Off 160
Total Available Funds $20,291,773.82
Ending Pool Balance $434,307,599.46
Ending Pool Factor 0.6076231
Servicing Fee $376,349.70
Repayment of Servicer Advances $0.00
Reserve Account:
Beginning Balance (see Memo Item) $24,202,849.90
Target Percentage 5.25%
Target Balance $22,801,148.97
Minimum Balance $14,295,295.01
(Release) / Deposit ($1,401,700.93)
Ending Balance $22,801,148.97
Current Weighted Average APR: 8.455%
Current Weighted Average Remaining Term (months): 36.38
<CAPTION>
Delinquencies Dollars Notes
<S> <C> <C> <C>
Installments: 1 - 30 days $2,723,180.92 2,176
31 - 60 days $650,615.76 537
60+ days $266,003.69 150
Total: $3,639,800.37 2,185
Balances: 60+ days $6,437,975.96 150
Memo Item - Reserve Account
Prior Month $23,710,030.83
+ Invest. Income $126,980.89
+ Excess Serv. $365,838.18
+ Transfer (to) / from Collections Account $0.00
Beginning Balance $24,202,849.90
</TABLE>
<PAGE>
Exhibit 20.6
Page 2 of 3
Navistar Financial 1999 - A Owner Trust
For the Month of August 2000
<TABLE>
<CAPTION>
NOTES
TOTAL CLASS A - 1 CLASS A - 2 CLASS A - 3 CLASS A - 4 CLASS B NOTES
<S> <C> <C> <C> <C> <C> <C>
$714,764,750.47 $147,000,000.00 $197,000,000.00 $200,000,000.00 $145,745,000.00 $25,019,750.47
Original Pool Amount
Distributions:
Distribution Percentages 0.00% 96.50% 0.00% 0.00% 3.50%
Coupon 5.0025% 5.5500% 5.9500% 6.1300% 6.2200%
Beginning Pool Balance $451,619,634.81
Ending Pool Balance $434,307,599.46
Collected Principal $15,963,587.77
Collected Interest $3,177,224.35
Charge - Offs $1,348,447.58
Liquidation Proceeds/Recoveries $1,150,961.70
Servicing $376,349.70
Cash Transfer from Reserve Account $0.00
Total Collections Available
for Debt Service $19,915,424.12
Beginning Balance $451,619,634.82 $0.00 $84,919,963.39 $200,000,000.00 $145,745,000.00 $20,954,671.43
Interest Due $2,237,550.59 $0.00 $392,754.83 $991,666.67 $744,514.04 $108,615.05
Interest Paid $2,237,550.59 $0.00 $392,754.83 $991,666.67 $744,514.04 $108,615.05
Principal Due $17,312,035.35 $0.00 $16,706,114.11 $0.00 $0.00 $605,921.24
Principal Paid $17,312,035.35 $0.00 $16,706,114.11 $0.00 $0.00 $605,921.24
Ending Balance $434,307,599.47 $0.00 $68,213,849.28 $200,000,000.00 $145,745,000.00 $20,348,750.19
Note / Certificate Pool Factor 0.0000 0.3463 1.0000 1.0000 0.8133
(Ending Balance / Original Pool Amount)
Total Distributions $19,549,585.94 $0.00 $17,098,868.94 $991,666.67 $744,514.04 $714,536.29
Interest Shortfall $0.00 $0.00 $0.00 $0.00 $0.00 $0.00
Principal Shortfall $0.00 $0.00 $0.00 $0.00 $0.00 $0.00
Total Shortfall $0.00 $0.00 $0.00 $0.00 $0.00 $0.00
(required from Reserve)
Excess Servicing $365,838.18
(see Memo Item - Reserve Account)
Beginning Reserve Acct Balance $24,202,849.90
(Release) / Draw ($1,401,700.93)
Ending Reserve Acct Balance $22,801,148.97
</TABLE>
<PAGE>
Exhibit 20.6
Page 3 of 3
Navistar Financial 1999 - A Owner Trust
For the Month of August 2000
Trigger Events:
A) Loss Trigger
B) Delinquency Trigger
C) Noteholders Percent Trigger
<TABLE>
<CAPTION>
5 4 3 2 1
Apr-00 May-00 Jun-00 Jul-00 Aug-00
<S> <C> <C> <C> <C> <C>
Beginning Pool Balance $517,062,538.52 $502,327,257.81 $484,389,584.90 $466,968,567.50 $451,619,634.81
A) Loss Trigger:
Principal of Contracts
Charged Off $1,512,792.75 $950,683.77 $707,604.90 $769,977.20 $1,348,447.58
Recoveries $1,430,422.22 $707,246.95 $690,800.91 $936,067.84 $1,150,961.70
Total Charged Off (Months 5, 4, 3) $3,171,081.42
Total Recoveries (Months 3, 2, 1) $2,777,830.45
Net Loss / (Recoveries) for 3 Mos $393,250.97 (a)
Total Balance (Months 5, 4, 3) $1,503,779,381.23 (b)
Loss Ratio Annualized [(a/b) * (12)] 0.3138%
Trigger: Is Ratio > 1.5% No
Jun-00 Jul-00 Aug-00
B) Delinquency Trigger: $6,533,519.05 $6,615,852.91 $6,437,975.96
Balance delinquency 60+ days 1.34881% 1.41677% 1.42553%
As % of Beginning Pool Balance 1.17929% 1.26862% 1.39704%
Three Month Average
Trigger: Is Average > 2.0% No
C) Noteholders Percent Trigger: 3.19002%
Ending Reserve Account Balance
not less than 1% of Initial Aggregate
Receivables Balance
Trigger: Is Minimum < 1.0% No
</TABLE>
Navistar Financial Corporation
by: /s/ R. W. Cain
R. W. Cain
Vice President and Treasurer
